WSR 07-01-092

PERMANENT RULES

BUILDING CODE COUNCIL


[ Filed December 19, 2006, 10:16 a.m. , effective July 1, 2007 ]


Effective Date of Rule: July 1, 2007.

Purpose: To adopt and amend the 2006 International Mechanical Code, chapter 51-52 WAC.

Citation of Existing Rules Affected by this Order: Repealing 1; and amending 10.

Statutory Authority for Adoption: RCW 19.27.190 and 19.27.020.

Other Authority: Chapters 19.27 and 34.05 RCW.

Adopted under notice filed as WSR 06-16-110 on August 1, 2006.

Changes Other than Editing from Proposed to Adopted Version: The exception to Section 601 was modified. New language for exception 5 now reads, "Make up or relief air in corridors of Group I-2 occupancies."

Number of Sections Adopted in Order to Comply with Federal Statute: New 0, Amended 0, Repealed 0; Federal Rules or Standards: New 0, Amended 0, Repealed 0; or Recently Enacted State Statutes: New 0, Amended 0, Repealed 0.

Number of Sections Adopted at Request of a Nongovernmental Entity: New 2, Amended 6, Repealed 1.

Number of Sections Adopted on the Agency's Own Initiative: New 1, Amended 2, Repealed 0.

Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 0, Amended 0, Repealed 0.

Number of Sections Adopted Using Negotiated Rule Making: New 0, Amended 0, Repealed 0; Pilot Rule Making: New 0, Amended 0, Repealed 0; or Other Alternative Rule Making: New 3, Amended 10, Repealed 1.

Date Adopted: November 17, 2006.

John Neff

Council Chair

OTS-8985.4


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/sm2Pa) 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 Feeta Outdoor Air

(Cubic feet per minute (cfm) per person) Unless Notede

Correctional facilities
Cells
without plumbing fixtures 20 20
with plumbing fixturesg 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 loungesb,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 roomsb -- 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
Bathroomsg -- 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 unitsb -- 1.5 cfm/ft2
Garages, separate for each dwelling -- 100 cfm per car
Kitchensg -- 100 cfm intermittent or 25 cfm continuous
Living areasc Based upon number of bedrooms. First bedroom: 2; each additional: 1 0.35 air changes per houra or 15 cfm per person, whichever is greater
Toilet rooms and bathroomsg -- Mechanical exhaust capacity of 50 cfm intermittent or 20 cfm continuous
Public spaces
Corridors and utilities -- 0.05 cfm/ft2
Elevator carg -- 1.00 cfm/ft2
Locker rooms 0.5 cfm/ft2
Shower rooms (per shower head)g 50 cfm intermittent or 20 cfm continuous
Smoking loungesb 70 60
Toilet roomsg 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 loungesb 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 roomb 2.0 cfm/ft2
Florist 8 15
Hardware, drug, fabrics 8 15
Nail salonb,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 garaged -- 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 processingc 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/(sm2), 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 50F 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.

[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.

((Termination point/exhaust outlet.)) 501.2.1 Location of exhaust outlets. 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.

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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.

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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.)) Make up or relief air in corridors of Group I-2 occupancies.
6. Corridors serving residential occupancies shall be permitted to be supplied without specific mechanical exhaust subject to the following:
6.1 The supply air is one hundred percent outside air; and
6.2 The units served by the corridor have conforming ventilation independent of the air supplied to the corridor; and
6.3 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 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.


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).

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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.

Washington State Code Reviser's Office