(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.
Paula Melton
Editorial DirectorBuildingGreen, Inc.
LEEDuser Expert
183 thumbs up
September 4, 2018 - 10:10 am
Hi, Maren! You can post your question here: https://leeduser.buildinggreen.com/credit/Pilot-Credits/EQpc47
Carissa Sawyer
Certification Team LeadGreen Business Certification Inc. (GBCI)
11 thumbs up
January 16, 2019 - 6:18 pm
Maren,
Assuming the project is detached and not within a half mile of any significant noise source, the following applies for bullet point 1:
Intermittent fans shall have a maximum sound rating of 1.5 sones, unless their maximum rated airflow exceeds 400 cfm. This would still apply to the intermittent range hood, unless it is over 400 cfm. Unless it is connected to the HRV and there is at least 4 feet of ductwork between the fan and the intake grill.
Carissa