Question

NFPA 90A require HVAC systems with a capacity of _______ to have return-side smoke detection when they serve more than one story.

Answer 1

NFPA 90A requires return-side smoke detection in HVAC systems with a capacity of 15,000 cfm or greater, when serving more than one story.

Step-by-step explanation:

The subject of this question is Engineering. The question is regarding the requirement of return-side smoke detection in HVAC systems as mandated by NFPA 90A when they serve more than one story. NFPA 90A is a specific standard developed by the National Fire Protection Association (NFPA) that provides guidelines for the installation of HVAC systems to ensure fire protection and safety. In accordance with NFPA 90A, HVAC systems with a capacity of 15,000 cfm or greater are required to have return-side smoke detection when they serve more than one story.