Abstract: 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.

Abstract: A ratcheted nut assembly is provided to enable a nut to be tightened onto a bolt in a limited area. The ratcheted nut assembly includes an internally threaded nut that has radially extending teeth on its outer surface. The nut is held rotatably captive within an elongated housing that has a generally "Y" shaped ratchet member pivoted so that the ratchet member may have pawls that are formed on it engaged with the teeth of the nut to rotate the nut. The operator positions the ratchet member into engagement with the radially extending teeth on the nut depending upon which direction the operator desires to turn the nut. The ratchet mechanism remains with the nut after the nut is tightened.