WASHINGTON STATE REGISTER

WSR 06-16-110

PROPOSED RULES

BUILDING CODE COUNCIL

[ Filed August 1, 2006, 11:23 a.m. ]

Original Notice.

Preproposal statement of inquiry was filed as WSR 06-07-124.

Title of Rule and Other Identifying Information: Amendment of chapter 51-52 WAC, adoption and amendment of the 2006 Edition of the International Mechanical Code (IMC) and International Fuel Gas Code (IFGC); 2006 Edition of the National Fuel Gas Code (NFPA 54); and the 2004 Edition of the Liquefied Petroleum Gas Code (NFPA 58).

Hearing Location(s): Spokane City Council Chambers, West 808 Spokane Falls Boulevard, Spokane, WA, on September 8, 2006, at 10:00 a.m.; and at the Holiday Inn Select Renton, One Grady Way South, Renton, WA, on October 13, 2006, at 10:00 a.m.

Date of Intended Adoption: November 17, 2006.

Submit Written Comments to: John Neff, Council Chair, P.O. Box 42525, Olympia, WA 98504-2525, e-mail sbcc@cted.wa.gov, fax (360) 586-9383, by October 13, 2006.

Assistance for Persons with Disabilities: Contact Sue Mathers by August 31, 2006, TTY (360) 586-0772 or (360) 725-2966.

Purpose of the Proposal and Its Anticipated Effects, Including Any Changes in Existing Rules: The proposed rules adopt the most recently published editions of the IMC, IFGC, NFPA 54 and NFPA 58 and make changes to the state amendments to those codes.

1. Section 101.2: The scoping section was amended to match new language in the 2006 edition of the International Mechanical Code (IMC), and to update the referenced editions of the National Fuel Gas Code and the Liquefied Petroleum Gas Code.

2. Section 101.5: This amendment was deleted.

3. Section 403.2: Exception 2 was added to coordinate with the Ventilation and Indoor Air Quality Code.

4. Section 403.2.1 and Table 403.3: This section was amended to strike item 4 allowing recirculation of exhaust up to 10% of the supply airstream from toilet rooms, bathrooms and similar areas and striking coordinating footnote h from the table.

5. Section 501.2: This section was amended to reword exception 1 to avoid any possible confusion with the requirement for whole house ventilation in the Ventilation and Indoor Air Quality Code.

6. Section 501.2.1: This section was amended to coordinate with the change to the 2006 edition of the IMC.

7. Section 504.6.3: This requirement was added to protect dryer exhaust ducts from penetrations that could collect lint and cause a fire hazard.

8. Section 506.3.3.1: This section was amended to allow the test to be performed without the building official present.

9. Section 601.2: The reference allowing corridors in hospitals built per IBC requirements to be used as plenums was deleted.

10. Section 601.3: The exceptions allowing exhaust ducts to pass through other ducts or plenums were deleted.

11. Chapter 10: Language was added noting that local jurisdictions may have regulations pertaining to boilers.

12. International Fuel Gas Code (IFGC) Section 101: The scoping section was amended to reference the National Fuel Gas Code for LP gas installations.

13. IFGC Section 404: The specifications for cathodic protection were removed from this section and the National Fuel Gas Code section 6.1.3.

Reasons Supporting Proposal: RCW 19.27.031 and 19.27.074.

Statutory Authority for Adoption: RCW 19.27.031 and 19.27.074.

Statute Being Implemented: Chapters 19.27 and 34.05 RCW.

Rule is not necessitated by federal law, federal or state court decision.

Agency Comments or Recommendations, if any, as to Statutory Language, Implementation, Enforcement, and Fiscal Matters: The council is seeking comments on the issues proposed in the following rules.

Name of Proponent: Washington state building code council, governmental.

Name of Agency Personnel Responsible for Drafting and Implementation: Krista Braaksma, P.O. Box 42525, Olympia, WA 98504-2525, (360) 725-2964; and Enforcement: Local jurisdictions.

No small business economic impact statement has been prepared under chapter 19.85 RCW. This rule will update the adoption of model codes to stay current with national standards for the benefit of industry and Washington state interests, with no new state amendments being included. No disproportionate economic impact on small business was identified.

A cost-benefit analysis is not required under RCW 34.05.328. The state building code council is not listed in this section as one of the agencies required to comply with this statute.

August 1, 2006

John P. Neff

Council Chair

OTS-8985.2

AMENDATORY SECTION(Amending WSR 04-01-104, filed 12/17/03, effective 7/1/04)

WAC 51-52-003 International Mechanical Code. The ((~~2003~~)) 2006 edition of the International Mechanical Code published by the International Code Conference is hereby adopted by reference with the exceptions noted in this chapter of the Washington Administrative Code (WAC).

[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-003, filed 12/17/03, effective 7/1/04.]

AMENDATORY SECTION(Amending WSR 04-01-104, filed 12/17/03, effective 7/1/04)

WAC 51-52-008 Implementation. The International Mechanical Code adopted by chapter 51-52 WAC shall become effective in all counties and cities of this state on July 1, ((~~2004~~)) 2007.

[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-008, filed 12/17/03, effective 7/1/04.]

AMENDATORY SECTION(Amending WSR 04-01-104, filed 12/17/03, effective 7/1/04)

WAC 51-52-0101 Section 101 -- General.

101.2 Scope. This code shall regulate the design, installation, maintenance, alteration and inspection of mechanical systems that are permanently installed and utilized to provide control of environmental conditions and related processes within buildings. This code shall also regulate those mechanical systems, system components, equipment and appliances specifically addressed herein. The installation of fuel gas distribution piping and equipment, fuel gas-fired appliances and fuel gas-fired appliance venting systems shall be regulated by the International Fuel Gas Code.

EXCEPTIONS: 1. Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress and their accessory structures shall comply with the International Residential Code.

2. ((~~Mechanical systems in existing buildings undergoing repair, alterations, or additions, and change of occupancy shall be permitted to comply with the International Existing Building Code.~~

3.)) The standards for liquefied petroleum gas installations shall be the ((~~2001~~)) 2004 Edition of NFPA 58 (Liquefied Petroleum Gas Code) and the ((~~2002~~)) 2006 Edition of ANSI Z223.1/NFPA 54 (National Fuel Gas Code).

((101.5 Other authorities. In addition to the International Mechanical Code, provisions of chapter 480-93 WAC regarding gas pipeline safety may also apply to single meter installations serving more than one building. The provisions of chapter 480-93 WAC are enforced by the Washington utilities and transportation commission.))

[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-0101, filed 12/17/03, effective 7/1/04.]

AMENDATORY SECTION(Amending WSR 04-01-104, filed 12/17/03, effective 7/1/04)

WAC 51-52-0202 Section 202 -- General definitions.

UNUSUALLY TIGHT CONSTRUCTION. Construction meeting the following requirements:

1. Walls exposed to the ((~~outside~~)) outdoor atmosphere having a continuous water vapor retarder with a rating of 1 perm (57 ng/s·m²·Pa) or less with openings gasketed or sealed; and

2. Operable windows and doors meeting the air leakage requirements of the International Energy Conservation Code, Section 502.1.4; and

3. Caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical and gas lines, and at other openings; or

4. Buildings built in compliance with the 1986 or later editions of the Washington State Energy Code, chapter 51-11 WAC, Northwest Energy Code, or Super Good Cents weatherization standards or equivalent.

[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-0202, filed 12/17/03, effective 7/1/04.]

AMENDATORY SECTION(Amending WSR 05-01-015, filed 12/2/04, effective 7/1/05)

WAC 51-52-0401 Section 401 -- General.

((~~401.5.2~~)) 401.4.2 Exhaust openings. Outdoor exhaust openings shall be located in accordance with Chapter 5. Exhaust air shall not be directed onto walkways.

[Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. 05-01-015, § 51-52-0401, filed 12/2/04, effective 7/1/05.]

AMENDATORY SECTION(Amending WSR 05-01-015, filed 12/2/04, effective 7/1/05)

WAC 51-52-0403 Section 403 -- Mechanical ventilation.

403.2 Outdoor air required. The minimum ventilation rate of outdoor air shall be determined in accordance with Section 403.3.

EXCEPTIONS: 1. Where the registered design professional demonstrates that an engineered ventilation system design will prevent the maximum concentration of contaminants from exceeding that obtainable by the rate of outdoor air ventilation determined in accordance with Section 403.3, the minimum required rate of outdoor air shall be reduced in accordance with such engineered system design.

2. Alternate systems designed in accordance with ASHRAE Standard 62.1-2004 Section 6.2, Ventilation Rate Procedure, shall be permitted.

403.2.1 Recirculation of air. The air required by Section 403.3 shall not be recirculated. Air in excess of that required by Section 403.3 shall not be prohibited from being recirculated as a component of supply air to building spaces, except that:

1. Ventilation air shall not be recirculated from one dwelling to another or to dissimilar occupancies.

2. Supply air to a swimming pool and associated deck areas shall not be recirculated unless such air is dehumidified to maintain the relative humidity of the area at 60 percent or less. Air from this area shall not be recirculated to other spaces where 10 percent or more of the resulting supply airstream consists of air recirculated from these spaces.

3. Where mechanical exhaust is required by Note b in Table 403.3, recirculation of air from such spaces shall be prohibited. All air supplied to such spaces shall be exhausted, including any air in excess of that required by Table 403.3.

(Item 4 is not adopted.)

403.3 Ventilation rate. Ventilation systems shall be designed to have the capacity to supply the minimum outdoor airflow rate determined in accordance with Table 403.3 based on the occupancy of the space and the occupant load or other parameter as stated therein. The occupant load utilized for design of the ventilation system shall not be less than the number determined from the estimated maximum occupant load rate indicated in Table 403.3. Ventilation rates for occupancies not represented in Table 403.3 shall be determined by an approved engineering analysis. The ventilation system shall be designed to supply the required rate of ventilation air continuously during the period the building is occupied, except as otherwise stated in other provisions of the code.

EXCEPTION: Where occupancy density is known and documented in the plans, the outside air rate may be based on the design occupant density. Under no circumstance shall the occupancies used result in outside air less than one-half that resulting from application of Table 403.3 estimated maximum occupancy rates.

Table 403.3
Required Outdoor Ventilation Air

Occupancy Classification Estimated Maximum Occupant Load, Persons per 1,000 Square Feet^a Outdoor Air
(Cubic feet per minute (cfm) per person) Unless Noted^e

Correctional facilities

Cells

without plumbing fixtures 20 20

with plumbing fixtures^g 20 20

Dining halls 100 15

Guard stations 40 15

Dry cleaners, laundries

Coin-operated dry cleaner 20 15

Coin-operated laundries 20 15

Commercial dry cleaner 30 30

Commercial laundry 10 25

Storage, pick up 30 35

Education

Auditoriums 150 15

Classrooms 50 15

Corridors -- 0.10 cfm/ft²

Laboratories 30 20

Libraries 20 15

Locker rooms -- 0.50 cfm/ft²

Music rooms 50 15

Smoking lounges^b,g 70 60

Training shops 30 20

Food and beverage service

Bars, cocktail lounges 100 30

Cafeteria, fast food 100 20

Dining rooms 70 20

Kitchens (cooking)^f,g 20 15

Hospitals, nursing and convalescent homes

Autopsy rooms^b -- 0.50 cfm/ft²

Medical procedure rooms 20 15

Operating rooms 20 30

Patient rooms 10 25

Physical therapy 20 15

Recovery and ICU 20 15

Hotels, motels, resorts and dormitories

Assembly rooms 120 15

Bathrooms^g -- 35

Bedrooms -- 30 cfm per room

Conference rooms 50 20

Dormitory sleeping areas 20 15

Gambling casinos 120 30

Living rooms -- 30 cfm per room

Lobbies 30 15

Offices

Conference rooms 50 20

Office spaces 7 20

Reception areas 60 15

Telecommunication centers and data entry 60 20

Private dwellings, single and multiple

Garages, common for multiple units^b -- 1.5 cfm/ft²

Garages, separate for each dwelling -- 100 cfm per car

Kitchens^g -- 100 cfm intermittent or 25 cfm continuous

Living areas^c Based upon number of bedrooms. First bedroom: 2; each additional: 1 0.35 air changes per hour^a or 15 cfm per person, whichever is greater

Toilet rooms and bathrooms^g -- Mechanical exhaust capacity of 50 cfm intermittent or 20 cfm continuous

Public spaces

Corridors and utilities -- 0.05 cfm/ft²

Elevator car^g -- 1.00 cfm/ft²

Locker rooms 0.5 cfm/ft²

Shower rooms (per shower head)^g 50 cfm intermittent or 20 cfm continuous

Smoking lounges^b 70 60

Toilet rooms^g 75 cfm per water closet or urinal

Retail stores, sales floors and showroom floors

Basement and street -- 0.30 cfm/ft²

Dressing rooms -- 0.20 cfm/ft²

Malls and arcades -- 0.20 cfm/ft²

Shipping and receiving -- 0.15 cfm/ft²

Smoking lounges^b 70 60

Storage rooms -- 0.15 cfm/ft²

Upper floors -- 0.20 cfm/ft²

Warehouses -- 0.05 cfm/ft²

Specialty shops

Automotive motor-fuel-dispensing stations -- 1.5 cfm/ft²

Barber 25 15

Beauty 25 25

Clothiers, furniture -- 0.30 cfm/ft²

Embalming room^b 2.0 cfm/ft²

Florist 8 15

Hardware, drug, fabrics 8 15

Nail salon^b,i -- 50 cfm intermittent or 20 cfm continuous per station

Pet shops -- 1.00 cfm/ft²

Reducing salons 20 15

Supermarkets 8 15

Sports and amusement

Ballrooms and discos 100 25

Bowling alleys (seating areas) 70 25

Game rooms 70 25

Ice arenas -- 0.50 cfm/ft²

Playing floors (gymnasiums) 30 20

Spectator areas 150 15

Swimming pools (pool and deck area) -- 0.50 cfm/ft²

Storage

Repair garages, enclosed parking garage^d -- 1.5 cfm/ft²

Warehouses -- 0.05 cfm/ft²

Theaters

Auditoriums 150 15

Lobbies 150 20

Stages, studios 70 15

Ticket booths 60 20

Transportation

Platforms 100 15

Vehicles 150 15

Waiting rooms 100 15

Workrooms

Bank vaults 5 15

Darkrooms -- 0.50 cfm/ft²

Duplicating, printing -- 0.50 cfm/ft²

Meat processing^c 10 15

Pharmacy 20 15

Photo studios 10 15

For SI: 1 cubic foot per minute = 0.0004719 m³/s, 1 ton = 908 kg, 1 cubic foot per minutes per square foot = 0.00508 m³/(s•m²), °C = [(°F) -32]/1.8, 1 square foot - 0.0929 m².

a. Based upon net floor area.

b. Mechanical exhaust required and the recirculation of air from such spaces as permitted by Section 403.2.1 is prohibited (see Section 403.2.1, Items 1 and 3).

c. Spaces unheated or maintained below 50°F are not covered by these requirements unless the occupancy is continuous.

d. Ventilation systems in enclosed parking garages shall comply with Section 404.

e. Where the ventilation rate is expressed in cfm/ft², such rate is based upon cubic feet per minute per square foot of the floor area being ventilated.

f. The sum of the outdoor and transfer air from adjacent spaces shall be sufficient to provide an exhaust rate of not less than 1.5 cfm/ft².

g. Transfer air permitted in accordance with Section 403.2.2.

h. Reserved.

i. The required exhaust system shall capture the contaminants and odors at their source.

Table 403.3
Required Outdoor Ventilation Air
Occupancy Classification	Estimated Maximum Occupant Load, Persons per 1,000 Square Feet^a	Outdoor Air (Cubic feet per minute (cfm) per person) Unless Noted^e
Correctional facilities
	Cells
		without plumbing fixtures	20	20
		with plumbing fixtures^g	20	20
	Dining halls	100	15
	Guard stations	40	15
Dry cleaners, laundries
	Coin-operated dry cleaner	20	15
	Coin-operated laundries	20	15
	Commercial dry cleaner	30	30
	Commercial laundry	10	25
	Storage, pick up	30	35
Education
	Auditoriums	150	15
	Classrooms	50	15
	Corridors	--	0.10 cfm/ft²
	Laboratories	30	20
	Libraries	20	15
	Locker rooms	--	0.50 cfm/ft²
	Music rooms	50	15
	Smoking lounges^b,g	70	60
	Training shops	30	20
Food and beverage service
	Bars, cocktail lounges	100	30
	Cafeteria, fast food	100	20
	Dining rooms	70	20
	Kitchens (cooking)^f,g	20	15
Hospitals, nursing and convalescent homes
	Autopsy rooms^b	--	0.50 cfm/ft²
	Medical procedure rooms	20	15
	Operating rooms	20	30
	Patient rooms	10	25
	Physical therapy	20	15
	Recovery and ICU	20	15
Hotels, motels, resorts and dormitories
	Assembly rooms	120	15
	Bathrooms^g	--	35
	Bedrooms	--	30 cfm per room
	Conference rooms	50	20
	Dormitory sleeping areas	20	15
	Gambling casinos	120	30
	Living rooms	--	30 cfm per room
	Lobbies	30	15
Offices
	Conference rooms	50	20
	Office spaces	7	20
	Reception areas	60	15
	Telecommunication centers and data entry	60	20
Private dwellings, single and multiple
	Garages, common for multiple units^b	--	1.5 cfm/ft²
	Garages, separate for each dwelling	--	100 cfm per car
	Kitchens^g	--	100 cfm intermittent or 25 cfm continuous
	Living areas^c	Based upon number of bedrooms. First bedroom: 2; each additional: 1	0.35 air changes per hour^a or 15 cfm per person, whichever is greater
	Toilet rooms and bathrooms^g	--	Mechanical exhaust capacity of 50 cfm intermittent or 20 cfm continuous
Public spaces
	Corridors and utilities	--	0.05 cfm/ft²
	Elevator car^g	--	1.00 cfm/ft²
	Locker rooms		0.5 cfm/ft²
	Shower rooms (per shower head)^g		50 cfm intermittent or 20 cfm continuous
	Smoking lounges^b	70	60
	Toilet rooms^g		75 cfm per water closet or urinal
Retail stores, sales floors and showroom floors
	Basement and street	--	0.30 cfm/ft²
	Dressing rooms	--	0.20 cfm/ft²
	Malls and arcades	--	0.20 cfm/ft²
	Shipping and receiving	--	0.15 cfm/ft²
	Smoking lounges^b	70	60
	Storage rooms	--	0.15 cfm/ft²
	Upper floors	--	0.20 cfm/ft²
	Warehouses	--	0.05 cfm/ft²
Specialty shops
	Automotive motor-fuel-dispensing stations	--	1.5 cfm/ft²
	Barber	25	15
	Beauty	25	25
	Clothiers, furniture	--	0.30 cfm/ft²
	Embalming room^b		2.0 cfm/ft²
	Florist	8	15
	Hardware, drug, fabrics	8	15
	Nail salon^b,i	--	50 cfm intermittent or 20 cfm continuous per station
	Pet shops	--	1.00 cfm/ft²
	Reducing salons	20	15
	Supermarkets	8	15
Sports and amusement
	Ballrooms and discos	100	25
	Bowling alleys (seating areas)	70	25
	Game rooms	70	25
	Ice arenas	--	0.50 cfm/ft²
	Playing floors (gymnasiums)	30	20
	Spectator areas	150	15
	Swimming pools (pool and deck area)	--	0.50 cfm/ft²
Storage
	Repair garages, enclosed parking garage^d	--	1.5 cfm/ft²
	Warehouses	--	0.05 cfm/ft²
Theaters
	Auditoriums	150	15
	Lobbies	150	20
	Stages, studios	70	15
	Ticket booths	60	20
Transportation
	Platforms	100	15
	Vehicles	150	15
	Waiting rooms	100	15
Workrooms
	Bank vaults	5	15
	Darkrooms	--	0.50 cfm/ft²
	Duplicating, printing	--	0.50 cfm/ft²
	Meat processing^c	10	15
	Pharmacy	20	15
	Photo studios	10	15

[Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. 05-01-015, § 51-52-0403, filed 12/2/04, effective 7/1/05.]

Reviser's note: The brackets and enclosed material following the text of the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.
AMENDATORY SECTION(Amending WSR 05-01-015, filed 12/2/04, effective 7/1/05)

WAC 51-52-0501 Section 501 -- General.

((~~501.5~~)) 501.2 Exhaust discharge. The air removed by every mechanical exhaust system shall be discharged outdoors at a point where it will not cause a nuisance and not less than the distances specified in Section 501.2.1. The air shall be discharged to a location from which it cannot again be readily drawn in by a ventilating system. Air shall not be exhausted into an attic or crawlspace.

EXCEPTIONS: 1. Whole-house cooling attic fans shall be permitted to discharge into the attic space of dwelling units having private attics.

2. Commercial cooking recirculating systems.

501.2.1 Termination point/exhaust outlet. The termination point ((or)) of exhaust outlets ((~~for exhaust ducts discharging to the atmosphere~~)) and ducts discharging to the outdoors shall be located with the following minimum distances:

1. For ducts conveying explosive or flammable vapors, fumes or dusts: 30 feet (9144 mm) from the property line; 10 feet (3048 mm) from operable openings into the building; 6 feet (1829 mm) from exterior walls and roofs; 30 feet (9144 mm) from combustible walls and operable openings into the building which are in the direction of the exhaust discharge; 10 feet (3048 mm) above adjoining grade.

2. For other product-conveying outlets: 10 feet (3048 mm) from ((~~the~~)) property lines; 3 feet (914 mm) from exterior walls and roofs; 10 feet (3048 mm) from operable openings into the building; 10 feet (3048 mm) above adjoining grade.

3. For environmental air duct exhaust: 3 feet (914 mm) from ((~~the~~)) property lines, 3 feet (914 mm) from operable openings into the building for all occupancies other that Group U, and 10 feet (3048 mm) from a mechanical air intake. ((~~This includes environmental air regulated by Sections 504 and 505, but does not include enclosed parking garage exhaust outlets regulated by Section 404.~~))

EXCEPTIONS: 1. The separation between an air intake and exhaust outlet on a single listed package HVAC unit.

2. Exhaust from environmental air systems other than garages may be discharged into an open parking garage.

3. Except for Group I occupancies, where ventilation system design circumstances require building HVAC air to be relieved, such as during economizer operation, such air may be relieved into an open or enclosed parking garage within the same building.

4. For specific systems: For clothes dryer exhaust, see Section 504.4; for kitchen hoods, see Section 506.3; and for subslab soil exhaust systems, see Section 512.4.

[Statutory Authority: RCW 19.27.020, 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. 05-01-015, § 51-52-0501, filed 12/2/04, effective 7/1/05.]

NEW SECTION
WAC 51-52-0504 Section 504 -- Clothes dryer exhaust.

504.6.3 Protection required. Plates or clips shall be placed where nails or screws from finish or other work are likely to penetrate the clothes dryer exhaust duct. Plates or clips shall be placed on the finished face of all framing members where there is less than 1-1/4 inches (32 mm) between the duct and the finished face of the framing material. The plate or clip shall be steel not less than 1/16 inch (1.59 mm) in thickness and of sufficient width to protect the duct.

[]

NEW SECTION
WAC 51-52-0506 Section 506 -- Commercial kitchen hood ventilation system ducts and exhaust equipment.

506.3.3.1 Grease duct test. Prior to the use or concealment of any portion of a grease duct system, a leakage test shall be performed. Ducts shall be considered to be concealed where installed in shafts or covered by coatings or wraps that prevent the duct work from being visually inspected on all sides. The permit holder shall be responsible to provide the necessary equipment and perform the grease duct leakage test. A light test or an approved equivalent test method shall be performed to determine that all welded and brazed joints are liquid tight. A light test shall be performed by passing a lamp having a power rating of not less than 100 watts through the entire section of duct work to be tested. The lamp shall be open so as to emit light equally in all directions perpendicular to the duct walls.

A test shall be performed for the entire duct system, including the hood-to-duct connection. The duct work shall be permitted to be tested in sections, provided that every joint is tested.

[]

AMENDATORY SECTION(Amending WSR 04-01-104, filed 12/17/03, effective 7/1/04)

WAC 51-52-0601 Section 601 -- General.

601.2 Air movement in egress elements. ((~~Exit access~~)) Corridors shall not serve as supply, return, exhaust, relief or ventilation air ducts.

EXCEPTIONS: 1. Use of a corridor as a source of makeup air for exhaust systems in rooms that open directly onto such corridors, including toilet rooms, bathrooms, dressing rooms, smoking lounges and janitor closets, shall be permitted provided that each such corridor is directly supplied with outdoor air at a rate greater than the rate of makeup air taken from the corridor.

2. Where located within a dwelling unit, the use of corridors for conveying return air shall not be prohibited.

3. Where located within tenant spaces of one thousand square feet (93 m²) or less in area, utilization of corridors for conveying return air is permitted.

4. Where such air is part of an engineered smoke control system.

5. ((~~Corridors conforming to the International Building Code in Group I occupancies.~~

6.)) Corridors serving residential occupancies shall be permitted to be supplied without specific mechanical exhaust subject to the following:

((~~6.1~~)) 5.1 The supply air is one hundred percent outside air; and

((~~6.2~~)) 5.2 The units served by the corridor have conforming ventilation independent of the air supplied to the corridor; and

((~~6.3~~)) 5.3 For other than high-rise buildings, the supply fan will automatically shut off upon activation of corridor smoke detectors which shall be spaced at no more than thirty feet (9,144 mm) on center along the corridor; or

((~~6.4~~)) 5.4 For high-rise buildings, corridor smoke detector activation will close required smoke/fire dampers at the supply inlet to the corridor at the floor receiving the alarm.

((601.3 Contamination prevention. Exhaust ducts under positive pressure, chimneys, and vents shall not extend into or pass through ducts or plenums.

~~EXCEPTION:~~ ~~Exhaust ducts conveying environmental air shall be permitted to pass through a duct or plenum provided that:~~

~~1. The duct is maintained under sufficient negative pressure to prevent leakage of the exhaust air to the surrounding duct or plenum; or~~

~~2. If maintained under a positive pressure with respect to the surrounding duct or plenum, the exhaust duct will be sealed to prevent leakage; or~~

~~3. The surrounding air stream is an exhaust air stream not intended for recirculation to the building and cross-contamination of the two air streams will not create a hazardous condition.~~))

[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-0601, filed 12/17/03, effective 7/1/04.]

AMENDATORY SECTION(Amending WSR 04-01-104, filed 12/17/03, effective 7/1/04)

WAC 51-52-1000 Chapter 10 -- Boilers, water heaters and pressure vessels.

SECTIONS 1003 THROUGH 1011, are not adopted.

Boilers and Unfired Pressure Vessels are regulated by chapter 70.79 RCW and chapter 296-104 WAC, and may be further regulated by the local jurisdiction.

[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-1000, filed 12/17/03, effective 7/1/04.]

NEW SECTION
WAC 51-52-21101 Section 101 -- General.

101.2 Scope. This code shall apply to the installation of fuel gas piping systems, fuel gas utilization equipment, gaseous hydrogen systems and regulated accessories in accordance with Section 101.2.1 through 101.2.5.

[]

AMENDATORY SECTION(Amending WSR 04-01-104, filed 12/17/03, effective 7/1/04)

WAC 51-52-22006 Chapter 6 -- Gas piping installation.

((6.1.3 Protection Against Corrosion. Metallic gas piping in contact with earth or other material that could corrode the piping shall be protected against corrosion in an approved manner, and cathodically protected in accordance with NACE RP-01-69. When dissimilar metals are joined underground, an insulating coupling or fitting shall be used. Piping shall not be laid in contact with cinders. Uncoated threaded or socket welded joints shall not be used in piping in contact with soil or where internal or external crevice corrosion is known to occur.))

[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-22006, filed 12/17/03, effective 7/1/04.]

REPEALER

The following section of the Washington Administrative Code is repealed:

WAC 51-52-21404 Section 404 -- Piping system installation.

EXCEPTIONS:	1. Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress and their accessory structures shall comply with the International Residential Code.
	2. ((~~Mechanical systems in existing buildings undergoing repair, alterations, or additions, and change of occupancy shall be permitted to comply with the International Existing Building Code.~~
	3.)) The standards for liquefied petroleum gas installations shall be the ((~~2001~~)) 2004 Edition of NFPA 58 (Liquefied Petroleum Gas Code) and the ((~~2002~~)) 2006 Edition of ANSI Z223.1/NFPA 54 (National Fuel Gas Code).

EXCEPTIONS:	1. Where the registered design professional demonstrates that an engineered ventilation system design will prevent the maximum concentration of contaminants from exceeding that obtainable by the rate of outdoor air ventilation determined in accordance with Section 403.3, the minimum required rate of outdoor air shall be reduced in accordance with such engineered system design.
	2. Alternate systems designed in accordance with ASHRAE Standard 62.1-2004 Section 6.2, Ventilation Rate Procedure, shall be permitted.

a.	Based upon net floor area.
b.	Mechanical exhaust required and the recirculation of air from such spaces as permitted by Section 403.2.1 is prohibited (see Section 403.2.1, Items 1 and 3).
c.	Spaces unheated or maintained below 50°F are not covered by these requirements unless the occupancy is continuous.
d.	Ventilation systems in enclosed parking garages shall comply with Section 404.
e.	Where the ventilation rate is expressed in cfm/ft², such rate is based upon cubic feet per minute per square foot of the floor area being ventilated.
f.	The sum of the outdoor and transfer air from adjacent spaces shall be sufficient to provide an exhaust rate of not less than 1.5 cfm/ft².
g.	Transfer air permitted in accordance with Section 403.2.2.
h.	Reserved.
i.	The required exhaust system shall capture the contaminants and odors at their source.

EXCEPTIONS:	1. Whole-house cooling attic fans shall be permitted to discharge into the attic space of dwelling units having private attics.
	2. Commercial cooking recirculating systems.

EXCEPTIONS:	1. The separation between an air intake and exhaust outlet on a single listed package HVAC unit.
	2. Exhaust from environmental air systems other than garages may be discharged into an open parking garage.
	3. Except for Group I occupancies, where ventilation system design circumstances require building HVAC air to be relieved, such as during economizer operation, such air may be relieved into an open or enclosed parking garage within the same building.

EXCEPTIONS:	1. Use of a corridor as a source of makeup air for exhaust systems in rooms that open directly onto such corridors, including toilet rooms, bathrooms, dressing rooms, smoking lounges and janitor closets, shall be permitted provided that each such corridor is directly supplied with outdoor air at a rate greater than the rate of makeup air taken from the corridor.
	2. Where located within a dwelling unit, the use of corridors for conveying return air shall not be prohibited.
	3. Where located within tenant spaces of one thousand square feet (93 m²) or less in area, utilization of corridors for conveying return air is permitted.
	4. Where such air is part of an engineered smoke control system.
	5. ((~~Corridors conforming to the International Building Code in Group I occupancies.~~
	6.)) Corridors serving residential occupancies shall be permitted to be supplied without specific mechanical exhaust subject to the following:
	((~~6.1~~)) 5.1 The supply air is one hundred percent outside air; and
	((~~6.2~~)) 5.2 The units served by the corridor have conforming ventilation independent of the air supplied to the corridor; and
	((~~6.3~~)) 5.3 For other than high-rise buildings, the supply fan will automatically shut off upon activation of corridor smoke detectors which shall be spaced at no more than thirty feet (9,144 mm) on center along the corridor; or
	((~~6.4~~)) 5.4 For high-rise buildings, corridor smoke detector activation will close required smoke/fire dampers at the supply inlet to the corridor at the floor receiving the alarm.

~~EXCEPTION:~~	~~Exhaust ducts conveying environmental air shall be permitted to pass through a duct or plenum provided that:~~
	~~1. The duct is maintained under sufficient negative pressure to prevent leakage of the exhaust air to the surrounding duct or plenum; or~~
	~~2. If maintained under a positive pressure with respect to the surrounding duct or plenum, the exhaust duct will be sealed to prevent leakage; or~~
	~~3. The surrounding air stream is an exhaust air stream not intended for recirculation to the building and cross-contamination of the two air streams will not create a hazardous condition.~~))

EXCEPTIONS:	1. Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress and their accessory structures shall comply with the International Residential Code.
	2. The standards for liquefied petroleum gas installations shall be the 2004 Edition of NFPA 58 (Liquefied Petroleum Gas Code) and the 2006 Edition of ANSI Z223.1/NFPA 54 (National Fuel Gas Code).

© Washington State Code Reviser's Office