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.
Existing HVAC System Upgrade or Expansion Description Guide describing how to upgrade or expand an existing HVAC system.
Whole-House Ventilation Strategies for New Homes Description This guide describes how to install a whole-building ventilation system to provide adequate dilution of indoor air contaminants.