Guides A-Z

Guide describing design and installation of compact duct systems for central heating and cooling systems.

Guide describing buried ducts in loose-fill attic insulation, a method that can only be used in dry climates.

Guide describing approaches to burying and encapsulating ducts in unconditioned attics to increase the overall R-value of duct insulation.

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.