PERMANENT RULES
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Number of Sections Adopted in Order to Comply with Federal Statute: New 0, Amended 0, Repealed 0; Federal Rules or Standards: New 0, Amended 0, Repealed 0; or Recently Enacted State Statutes: New 0, Amended 0, Repealed 0.
Number of Sections Adopted at Request of a Nongovernmental Entity: New 2, Amended 6, Repealed 1.
Number of Sections Adopted on the Agency's Own Initiative: New 1, Amended 2, Repealed 0.
Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 0, Amended 0, Repealed 0.
Number of Sections Adopted Using Negotiated Rule Making: New 0, Amended 0, Repealed 0; Pilot Rule Making: New 0, Amended 0, Repealed 0; or Other Alternative Rule Making: New 3, Amended 10, Repealed 1.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.]
[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-008, filed 12/17/03, effective 7/1/04.]
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. (( |
|
[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-0101, filed 12/17/03, effective 7/1/04.]
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.]
((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.]
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. |
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. |
| 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/(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. |
[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. |
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. |
[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.]
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.
[]
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.
[]
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. (( |
|
| 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. |
[Statutory Authority: RCW 19.27.031 and 19.27.074. 04-01-104, § 51-52-0601, filed 12/17/03, effective 7/1/04.]
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.]
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). |
[]
((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.]
The following section of the Washington Administrative Code is repealed:
| WAC 51-52-21404 | Section 404 -- Piping system installation. |