Duct Access Door

An access panel for an opening in a duct system, the access panel comprising:

• a base plate having an exterior surface side and an interior surface side, wherein the base plate is positioned against the opening of the duct system such that the interior surface side faces towards the duct system and the exterior surface side faces away from the duct system;
• wherein the interior surface side of the base plate has defined a first interior surface section having a profile corresponding substantially to the opening in the duct system, and a second interior surface section defined between the first interior surface section and an outside edge of the base plate, such that when the base plate is positioned against the opening of the duct system the first interior surface section resides about the opening of the duct system and the second interior surface section overlaps a duct edge defined about a periphery of the opening in the duct system;
• and
• a plurality of rotatable fasteners separately positioned through openings in the base plate about the profile of the first interior surface section, each fastener having a locking clip extending from the fastener about the interior surface side of the first interior surface section and said locking clip being configured to move into a locking position, said locking position defined when the locking clip is rotated to extend over and engage the duct edge, and each fastener having a top portion accessible from the exterior surface side of the base plate such that when the top portion is rotated the locking clip rotates therewith and wherein each fastener is further configured to include:
• a bottom plate secured to the interior surface side of the access panel, a rotatable cylinder having one end configured to the top portion, an o-ring positioned between the top portion and the bottom plate for sealing the openings in the base plate, a support flange extending from an edge of the bottom plate to a rear face portion defined on the cylinder, and the locking clip secured to the cylinder and rotatable therewith, the locking clip having a portion that is configured to move into engagement over a portion of the duct edge when the cylinder rotates, such that when the access panel is positioned with the first interior surface section on the interior surface against the opening in the duct system and one or more of the plurality of rotatable fasteners are moved to said locking position, one or more of the locking clips rotate to extend over and engage the duct edge to secure the base plate to access panel, each fastener further includes a threaded bore section through the top portion towards the bottom plate and a screw having corresponding thread to secure to the top portion, and a washer positioned between the top portion and a head of the screw;
• whereby when the access panel is positioned with the first interior surface section on the interior surface against the opening in the duct system and one or more of the plurality of rotatable fasteners are moved to said locking position, one or more of the locking clips rotate to extend over and engage the duct edge to secure the duct system to the base plate.

A fastener comprising:

• a bottom plate;
• a rotatable cylinder having one end configured to a top portion;
• an o-ring positioned between the top portion and the bottom plate;
• a support flange extending from an edge of the bottom plate to a rear face portion defined on the cylinder;
• a locking clip secured to the cylinder and rotatable therewith, the locking clip having a portion that is configured to move when the cylinder rotates;
• an internally threaded bore positioned through the rotatable cylinder towards the bottom plate;
• and
• a screw with a threaded corresponding to the bore to allow the screw to fasten into the internally threaded bore, the screw further includes a head and a washer positioned between the head and the bottom plate.