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Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.

Guide describing removal of construction debris from flex ducts and protection of ducts and HVAC equipment during construction to keep them free of dust and debris.

Guide describing categories of direct-vent combustion space- and water-heating equipment and combustion safety testing.

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