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

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)

Guide describing how to install back-draft dampers in exhaust fans to make a shared duct possible.

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

Guide outlining how to correctly install flex ducts without excessive coils or loops.