(Posting here because Pilot Credits weren't listed as an option.)
Our project has only one continuous ventilation fan, the heat recovery ventilator which is installed in the mechanical room with >4' of ductwork between the fan and the intake grill. Range hood fan is intermittent. HVAC system has an air handler, also in the mechanical room. Am I correct to assume that none of the requirements in the first point apply then, and I just need to document requirements for the second?
Mechanical systems must meet the following requirements:
- Continuous ventilation fans shall have a maximum sound rating of 0.7 sones. Intermittent fans shall have a maximum sound rating of 1.5 sones, unless their maximum rated airflow exceeds 400 cfm. HVAC air handlers and remote-mounted fans are exempted, if the fans are mounted outside the habitable spaces, bathrooms, and hallways, and if there is at least 4 feet of ductwork between the fan and the intake grill.
- Meet the following best-practice HVAC installation measures:
- Ducts are securely attached (no loose connections between sections of ductwork).
- The fan housing is securely anchored.
- The damper flap closes fully, with no visible airspaces around the flap.
