Duct access door for circular openings

摘要

A duct access door to close and seal a circular opening in an HVAC duct is provided. The access door includes an outer cover which completely covers the circular hole and has a gasket for sealing against the duct. An inner panel fits within the circular hole and threaded fastener bias the outer cover towards the inner panel to seal the circular hole in the duct. Insulation may be provided between the outer cover and the inner panel of the access door if desired.