Guides A-Z

Guide describing categories of direct-vent combustion space- and water-heating equipment and combustion safety testing.

Guide describing the use of electronically commutated motors (ECMs) in HVAC central air handler fans to reduce power consumption compared to a single-stage fan motor.

Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.

Guide describing requirements and best practices for mechanical garage exhaust in multifamily buildings.

Guide describing how to air seal and insulate flex ducts.

This guide presents central and individual dwelling unit ventilation and exhaust strategies for multifamily construction.

Guide describing how to select and install whole-house ventilation systems for existing homes.