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// CODE SNIPPET

606.2.1 Return Air Systems

Mechanical Code 2018 of Maryland > 6 Duct Systems > 606 Smoke Detection Systems Control > 606.2 Where Required > 606.2.1 Return Air Systems
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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.
Exception: 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.

Related Code Sections


17.7.5.4.2.2* Initiating Devices, Return Air System
Unless otherwise modified by 17.7.5.4.2.2(A) or 17.7.5.4.2.2(B), if the detection of smoke in the return air system is required by other NFPA ...
National Fire Alarm and Signaling Code 2016 of Maryland > 17 Initiating Devices > 17.7 Smoke-Sensing Fire Detectors > 17.7.5* Smoke Detectors for Control of Smoke Spread > 17.7.5.4 Application > 17.7.5.4.2* Smoke Detection for Air Duct System > 17.7.5.4.2.2* Return Air System
606.2.1 Duct Systems, Return Air Systems
Smoke detectors shall be installed in return air systems with a design capacity greater than 2,000 cfm (0.9 m 3 /s), in the return air duct ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 606 Smoke Detection Systems Control > 606.2 Where Required > 606.2.1 Return Air Systems
606.2 Duct Systems, Where Required
in return air systems with a design capacity greater than 2,000 cfm (0.9 m 3 /s), in the return air duct or plenum upstream of any filters, exhaust air ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 606 Smoke Detection Systems Control > 606.2 Where Required
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