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Guide describing how to install ventilation air inlets in open locations at a safe distance from potential air contamination sources.

Guide describing a method for insulating an unvented attic by spraying foam insulation along the underside of the roof deck.

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

Guide describing how to conduct duct leakage tests per RESNET protocols.

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

Guide describing how to install transfer grilles 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 condensing boilers and hot water heat distribution systems used for home heating.