PROPOSED RULES
Original Notice.
Preproposal statement of inquiry was filed as WSR 06-07-123.
Title of Rule and Other Identifying Information: Amendment of chapter 51-13 WAC, Washington State Ventilation and Indoor Air Quality Code.
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 amend the Washington State Ventilation and Indoor Air Quality Code. The proposed rule updates references to national standards and adds Clark County to the list of high radon potential counties in Section 501.2.2.
Reasons Supporting Proposal: RCW 19.27.190 and 19.27.020.
Statutory Authority for Adoption: RCW 19.27.190 and 19.27.020.
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-8986.1
AMENDATORY SECTION(Amending WSR 04-07-192, filed 3/24/04,
effective 7/1/04)
WAC 51-13-304
Mechanical ventilation criteria and
minimum ventilation performance for all other occupancies not
covered in sections 302 and 303.
304.1 Ventilation: The minimum requirements for operable
area to provide natural ventilation are specified in the
International Building Code (IBC) as adopted by the state of
Washington.
Where a mechanical ventilation system is installed, the
mechanical ventilation system shall be capable of supplying
ventilation air to each zone with the minimum outdoor air
quantities specified in Table 3-4.
TABLE 3-1 TABLE 3-2 Area, ft2 TABLE 3-3 CFM @ 0.25
W.G. Flex Diameter Length Feet Smooth Diameter Length Feet Elbows1 TABLE 3-4 Maximum2Occupancy P/1000 ft2 or 100 m2 Requirements cfm/person Occupancy Facilities Stories6 centers and data entry areas or urinal10 and deck area)15 TABLE 3-5 Flow (CFM) Per Table 3-2 Smooth Duct Diameter Flexible Duct Diameter Length1 Number of Elbows2 TABLE 3-6 volume from Table 3-2 Smooth Duct Diameter Flexible Duct Diameter
[Statutory Authority: RCW 19.27.190, 19.27.020, and chapters
19.27 and 34.05 RCW. 04-07-192, § 51-13-304, filed 3/24/04,
effective 7/1/04. Statutory Authority: RCW 19.27.190,
19.27.020. 01-02-099, § 51-13-304, filed 1/3/01, effective
7/1/01. Statutory Authority: RCW 19.27.190. 95-01-128, §
51-13-304, filed 12/21/94, effective 6/30/95. Statutory
Authority: RCW 19.27.190(2) and 1992 c 132. 93-02-056, §
51-13-304, filed 1/6/93, effective 7/1/93. Statutory
Authority: RCW 19.27.190. 91-01-102, § 51-13-304, filed
12/18/90, effective 7/1/91.]
[Statutory Authority: RCW 19.27.190. 95-01-128, § 51-13-501,
filed 12/21/94, effective 6/30/95; 91-01-102, § 51-13-501,
filed 12/18/90, effective 7/1/91.]
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 3-4 estimated maximum occupancy values.
The outdoor air shall be ducted in a fully enclosed path
directly to every air handling unit in each zone not provided
with sufficient operable area for natural ventilation.
EXCEPTION:
Ducts may terminate within 12 inches of the intake to an HVAC unit provided they are physically
fastened so that the outside air duct is directed into the unit intake.
In all parking garages, other than open parking garages
as defined in IBC 406.3, used for storing or handling of
automobiles operating under their own power and on all loading
platforms in bus terminals, ventilation shall be provided at
1.5 cfm per square foot of gross floor area. The building
official may approve an alternate ventilation system designed
to exhaust a minimum fourteen thousand cfm for each operating
vehicle. Such system shall be based on the anticipated
instantaneous movement rate of vehicles but not less than 2.5
percent (or one vehicle) of the garage capacity. Automatic
carbon monoxide sensing systems may be submitted for approval.
In all buildings used for the repair of automobiles, each
repair stall shall be equipped with an exhaust extension duct,
extending to the outside of the building, which if over ten
feet in length, shall mechanically exhaust three hundred cfm. Connecting offices and waiting rooms shall be supplied with
conditioned air under positive pressure.
Combustion air requirements shall conform to the
requirements of Chapter 7 of the International Mechanical Code
(IMC).
Mechanical refrigerating equipment and rooms storing
refrigerants shall conform to the requirements of Chapter 11
of the IMC.
304.2 Alternate Systems: Alternate systems designed in
accordance with ASHRAE Standard 62.1.((1999))2004 shall be
permitted.
Minimum Source Specific Ventilation Capacity
Requirements
Bathrooms
Kitchens
Intermittently operating
50 cfm
100 cfm
Continuous operation
20 cfm
25 cfm
Ventilation Rates For All Group R Occupancies four (4) stories and less*
Minimum and Maximum Ventilation Rates: Cubic Feet Per Minute (CFM)
Floor
Bedrooms
2 or less
3
4
5
6
7
8
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
<500
50
75
65
98
80
120
95
143
110
165
125
188
140
210
501-1000
55
83
70
105
85
128
100
150
115
173
130
195
145
218
1001-1500
60
90
75
113
90
135
105
158
120
180
135
203
150
225
1501-2000
65
98
80
120
95
143
110
165
125
188
140
210
155
233
2001-2500
70
105
85
128
100
150
115
173
130
195
145
218
160
240
2501-3000
75
113
90
135
105
158
120
180
135
203
150
225
165
248
3001-3500
80
120
95
143
110
165
125
188
140
210
155
233
170
255
3501-4000
85
128
100
150
115
173
130
195
145
218
160
240
175
263
4001-5000
95
143
110
165
125
188
140
210
155
233
170
255
185
278
5001-6000
105
158
120
180
135
203
150
225
165
248
180
270
195
293
6001-7000
115
173
130
195
145
218
160
240
175
263
190
285
205
308
7001-8000
125
188
140
210
155
233
170
255
185
278
200
300
215
323
8001-9000
135
203
150
225
165
248
180
270
195
293
210
315
225
338
>9000
145
218
160
240
175
263
190
285
205
308
220
330
235
353
*For residences that exceed 8 bedrooms, increase the minimum requirement listed for 8 bedrooms by an additional 15 CFM per
bedroom. The maximum CFM is equal to 1.5 times the minimum.
Prescriptive Exhaust Duct Sizing
Fan
Tested
Minimum
Maximum
Minimum
Maximum
Maximum
50
4 inch
25
4 inch
70
3
50
5 inch
90
5 inch
100
3
50
6 inch
No
Limit
6 inch
No
Limit
3
80
4 inch2
NA
4 inch
20
3
80
5 inch
15
5 inch
100
3
80
6 inch
90
6 inch
No
Limit
3
100
5 inch2
NA
5 inch
50
3
100
6 inch
45
6 inch
No
Limit
3
125
6 inch
15
6 inch
No
Limit
3
125
7 inch
70
7 inch
No
Limit
3
1.
For each additional elbow subtract 10 feet from length.
2.
Flex ducts of this diameter are not permitted with fans of this
size.
Outdoor air requirements for ventilation1
Occupancies not subject to sections 302 and 303
Application
Estimated
Outdoor Air
Dry Cleaners, Laundries3
Commercial laundry
10
25
Commercial dry cleaner
30
30
Storage, pick up
30
35
Coin-operated laundries
20
15
Coin-operated dry cleaner
20
15
Dwelling Units In Buildings Greater Than Four Stories or Attached to
I-
Bedroom & living area24
15
Food and Beverage Service
Dining rooms
70
20
Cafeteria, fast food
100
20
Bars, cocktail lounges4
100
30
Kitchens (cooking)23
20
15
Garages, Repair, Service Stations
Enclosed parking garage5
1.50 cfm/ft.sq.
Auto repair rooms
1.50 cfm/ft.sq.
Hotels, Motels, Resorts, Congregate Residences with More Than
Four
Bedrooms
30 cfm/room
Living Rooms
30 cfm/room
Bath7
35 cfm/room
Lobbies
30
15
Conference rooms
50
20
Assembly rooms
120
15
Gambling casinos4
120
30
Offices
Office space9
7
20
Reception area
60
15
Telecommunication
60
20
Conference rooms
50
20
Public Spaces
Corridors and utilities
0.05 cfm/ft.sq.
Public restroom, cfm/wc
50
Lockers and dressing rooms
0.50 cfm/ft.sq.
Smoking lounge11
70
60
Elevators12
1.0 cfm/ft.sq.
Retail Stores, Sales Floors, and Show Room Floors
Basement and street
30
0.30 cfm/ft.sq.
Upper floors
20
0.20 cfm/ft.sq.
Storage rooms
15
0.15 cfm/ft.sq.
Dressing rooms
0.20 cfm/ft.sq.
Malls and arcades
20
0.20 cfm/ft.sq.
Shipping and receiving
10
0.15 cfm/ft.sq.
Smoking lounge11
70
60
Warehouses
5
0.05 cfm/ft.sq.
Speciality Shops
Barber
25
15
Beauty
25
25
Reducing salons
20
15
Florists13
8
15
Clothiers, furniture
0.30 cfm/ft.sq.
Hardware, drugs, fabric
8
15
Supermarkets
8
15
Pet shops
1.00 cfm/ft.sq.
Sports and Amusement14
Spectator areas
150
15
Game rooms
70
25
Ice arenas (playing areas)
0.50 cfm/ft.sq.
Swimming Pools (pool
0.50 cfm/ft.sq.
Playing floor (gymnasium)
30
20
Ballrooms and discos
100
25
Bowling alleys (seating
areas)
70
25
Theaters16
Ticket booths
60
20
Lobbies
150
20
Auditorium
150
20
Stages, studios
70
15
Transportation17
Waiting rooms
100
15
Platforms
100
15
Vehicles
150
15
Workrooms
Meat processing18
10
15
Photo studios
10
15
Darkrooms
10
0.50 cfm/ft.sq.
Pharmacy
20
15
Bank vaults
5
15
Duplicating, printing19
0.50 cfm/ft.sq.
INSTITUTIONAL FACILITIES
Education
Classroom
50
15
Laboratories20
30
20
Training shop
30
20
Music rooms
50
15
Libraries
20
15
Locker rooms
0.50 cfm/ft.sq.
Corridors
0.10 cfm/ft.sq.
Auditoriums
150
15
Smoking lounges11
70
60
Hospitals, Nursing and Convalescent Homes
Patient rooms21
10
25
Medical procedure
20
15
Operating rooms
20
30
Recovery and ICU
20
15
Autopsy rooms22
0.50 cfm/ft.sq.
Physical Therapy
20
15
Correctional Facilities
Cells
20
20
Dining halls
100
15
Guard station
40
15
1.
Derived from ASHRAE Standard 62-1989.
2.
Net occupiable space.
3.
Dry-cleaning process may require more air.
4.
Supplementary smoke-removal equipment may be required.
5.
Distribution among people must consider worker location and
concentration of running engine; stands where engines are run
must incorporate systems for positive engine exhaust
withdrawal. Contaminant sensors may be used to control
ventilation.
6.
Independent of room size.
7.
Installed capacity for intermittent use.
8.
See also food and beverage service, merchandising, barber and
beauty shops, garages.
9.
Some office equipment may require local exhaust.
10.
Mechanical exhaust with no recirculation is recommended.
11.
Normally supplied by transfer air, local mechanical exhaust;
with no recirculation recommended.
12.
Normally supplied by transfer air.
13.
Ventilation to optimize plant growth may dictate
requirements.
14.
When internal combustion engines are operated for
maintenance of playing surfaces, increased ventilation rates
may be required.
15.
Higher values may be required for humidity control.
16.
Special ventilation will be needed to eliminate special stage
effects.
17.
Ventilation within vehicles may require special
considerations.
18.
Spaces maintained at low temperatures (-10°F. to+ 50°F.) are
not covered by these requirements unless the occupancy is
continuous. Ventilation from adjoining spaces is permissible.
When the occupancy is intermittent, infiltration will
normally exceed the ventilation requirements.
19.
Installed equipment must incorporate positive exhaust and
control of undesirable contaminants.
20.
Special contamination control systems may be required for
processes or functions including laboratory animal occupancy.
21.
Special requirements or codes and pressure relationships may
determine minimum ventilation rates and filter efficiency.
Procedures generating contaminants may require higher rates.
22.
Air shall not be recirculated into other spaces.
23.
Makeup air for hood exhaust may require more ventilating
air.
24.
Occupant loading shall be based on the number of bedrooms as
follows: first bedroom, two persons; each additional bedroom,
one person. Where higher occupant loadings are known, they
shall be used.
Prescriptive Integrated Forced Air Supply Duct Sizing
Required
Minimum
Minimum
Maximum
Maximum
50-80
6"
7"
20'
3
80-125
7"
8"
20'
3
115-175
8"
10"
20'
3
170-240
9"
11"
20'
3
1.
For lengths over 20 feet increase duct diameter 1 inch.
2.
For elbows numbering more than 3 increase duct diameter 1 inch.
Prescriptive Supply Fan Duct Sizing
Supply Fan Tested CFM At 0.4" WG
Specified
Minimum
Minimum
50-90 CFM
4 inch
5 inch
90-150 CFM
5 inch
6 inch
150-250 CFM
6 inch
7 inch
250-400 CFM
7 inch
8 inch
AMENDATORY SECTION(Amending WSR 95-01-128, filed 12/21/94,
effective 6/30/95)
WAC 51-13-501
Scope.
501.1 General: The criteria of this chapter establishes
minimum radon resistive construction requirements for all
Group R Occupancies. These requirements are adopted pursuant
to the ventilation requirements of Section 7, of Chapter 2 of
the Session Laws of 1990.
501.2 Application: The requirements of this chapter
shall be adopted and enforced by all jurisdictions of the
state according to the following subsections:
501.2.1: All jurisdictions of the state shall comply
with section 502.
501.2.2: Clark, Ferry, Okanogan, Pend Oreille, Skamania,
Spokane, and Stevens counties shall also comply with section
503.
© Washington State Code Reviser's Office