Guides A-Z

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

Guide describing how to install ducted returns in bedroom walls to balance air pressures between rooms and to enable stale air to return to a central heating system's air handler for reconditioning even when room doors are closed.

Guide describing how to upgrade or expand an existing HVAC system.

Guide describing how to install jump ducts in bedroom walls to balance air pressures between rooms, enabling constant air flow for conditioning and freshness even when room doors are closed.

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

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.