Back-Draft Dampers at Shared Common Exhaust Duct Description Guide describing how to install back-draft dampers in exhaust fans to make a shared duct possible.
Common Exhaust Duct Not Shared by Fans in Separate Dwellings Description Guide describing correct ducting for exhaust fans.
Ventilation Air Inlet Locations Description Guide describing how to install ventilation air inlets in open locations at a safe distance from potential air contamination sources.
