Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-52 - State Building Code adoption and amendment of the 2021 edition of the International Mechanical Code › Section 51-52-0606 - Section 606-Smoke detection systems control

Current through Register Vol. 24-14, July 15, 2024
606.2.1 Return air systems.
Smoke detectors shall
				be installed in return air systems with a design capacity greater than 2,000
				cfm (0.9 m3/s), in the return air duct or plenum
				upstream of any filters, exhaust air connections, outdoor air connections, or
				decontamination equipment and appliances.
EXCEPTIONS:
1. Smoke detectors are not required in the return air
						  system where all portions of the building served by the air distribution system
						  are protected by area smoke detectors connected to a fire alarm system in
						  accordance with the International Fire Code. The area smoke detection system
						  shall comply with Section 606.4.
2. Smoke detectors are not required in the air system
						  where all of the air is exhausted and not recirculated back to any portion of
						  the building. Additionally, smoke detectors are not required in the supply
						  system that provides the make-up air for the exhaust system.
606.2.2 Common supply and return air systems.
Where multiple air-handling systems share common supply or return air ducts or
				plenums with a combined design capacity greater than 2,000 cfm (0.9
				m3/s), the return air system shall be provided with
				smoke detectors in accordance with Section 606.2.1.
EXCEPTION:
Individual smoke detectors shall not be required for
						  each fan-powered terminal unit, provided that such units do not have an
						  individual design capacity greater than 2,000 cfm (0.9
						  m3/s) and will be shut down by activation of one of
						  the following:
1. Smoke detectors required by Sections 606.2.1 and
						  606.2.3.
2. An approved area smoke detector system located in
						  the return air plenum serving such units.
3. An area smoke detector system as prescribed in the
						  exception to Section 606.2.1.
In all cases, the smoke detectors shall comply with Sections
				606.4 and 606.4.1.
The shut down of fan-powered terminal units may be performed by
				a building automation system upon activation of smoke detection as described in
				Section 606.2.2, Exception Items 1, 2, or 3. The building automation system is
				not required to be listed as a smoke control system and is not required to
				comply with UL 864.
606.2.4 Corridors serving Group R occupancies in other
				than high-rise buildings.
Corridors that serve Group R occupancies in
				other than high-rise buildings and that are mechanically ventilated with supply
				air shall be equipped with smoke detectors spaced in accordance with NFPA 72.
				The supply fan shall automatically shut off upon activation of the corridor
				smoke detectors.
EXCEPTION:
Corridor smoke detection is not required when air is
						  returned back to the supply fan from the corridor and return air smoke
						  detectors are
606.2.5 Corridors serving Group R occupancies in
				high-rise buildings.
Corridors that serve Group R occupancies in high-rise buildings
				and that are mechanically ventilated with supply air shall be equipped with
				smoke detectors that are spaced in accordance with NFPA 72 and air supply
				inlets to the corridor shall be provided with smoke/fire dampers. The supply
				inlet smoke/fire dampers shall automatically close upon activation of the
				corridor smoke detectors.
EXCEPTIONS:
1. Corridor smoke detection is not required to close
						  the supply inlet smoke/fire dampers when the smoke/fire dampers are used as
						  part of an approved building stairwell or elevator hoistway pressurization
						  smoke control system.
2. Corridor smoke detection is not required when air is
						  returned back to the supply fan from the corridor and return air smoke
						  detectors are installed in the return air duct or plenum upstream of any
						  filters, exhaust air connections, outdoor air connections, or decontamination
						  equipment and appliances designed to automatically shut off the supply
						  fan.
Statutory Authority:
				  RCW
				    19.27.190,
				  19.27.074,
				  19.27.031 and
				  chapters
				  19.27 and
				  34.05 RCW. 10-03-099, §
				  51-52-0606, filed 1/20/10, effective
				  7/1/10.