Guides A-Z

Guide describing air-sealing of the seams and holes in HVAC air handler and furnace cabinets.

No outdoor air intakes connected to return side of the HVAC system, unless controls are installed to operate intermittently & automatically based on a timer and to restrict intake when not in use (e.g., motorized damper)

This guide describes how to install a whole-building ventilation system to provide adequate dilution of indoor air contaminants.