// CODE SNIPPET
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.
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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