Abstract: A chimney tee cap retainer assembly comprising a cap, a first member comprising a guideway extending in a longitudinal direction, the first member connectable to the cap using a first fastener, a second member having a sprung end portion, the sprung end portion for releasably engaging a chimney surface, the second member adjustably engaged with the guideway using a second fastener, a third member having a sprung end portion, the sprung end portion for releasably engaging a chimney surface, the third member adjustably engaged with the guideway using a third fastener, and the second member and the third member each having a second member portion and a third member portion each extending normal to the first member and each extending in the same axial direction.

Abstract: A prefabricated, modular, duct assembly comprising a main duct having an outer wall, an inner wall, a first end and a second end. A horizontal duct assembly extending through the main duct between the first end and the second end. A vertical duct assembly extending along the inner wall from the horizontal duct assembly to the first end.

Abstract: A prefabricated, modular, duct assembly comprising a main duct having an outer wall, an inner wall, a first end and a second end. A horizontal duct assembly extending through the main duct between the first end and the second end. A vertical duct assembly extending along the inner wall from the horizontal duct assembly to the first end.

Abstract: A temporary, moveable marker for directing emergency aircraft to a landing zone employs a set of four panels which are foldable into a compact configuration. These panels are deployed in a substantially rectangular configuration to provide markings for an emergency landing zone and are attached by three hinges. This creates two panels with hinges on the two interior sides of the respective rectangles and two panels, each with one hinge on one interior side. All panels have aligning apertures so that the panels can be collapsed on top of each other to form one rectangle with an aperture through which a screw can be placed and affixed with a wing-nut on the other end, thus keeping the four panels attached. The collapsed set of four panels lie flat with at least one handle on an exterior side to allow for easy storage and transportation.

Abstract: A chimney tee cap retainer assembly comprising a cap, a first member comprising a guideway extending in a longitudinal direction, the first member connectable to the cap using a first fastener, a second member having a sprung end portion, the sprung end portion for releasably engaging a chimney surface, the second member adjustably engaged with the guideway using a second fastener, a third member having a sprung end portion, the sprung end portion for releasably engaging a chimney surface, the third member adjustably engaged with the guideway using a third fastener, and the second member and the third member each having a second member portion and a third member portion each extending normal to the first member and each extending in the same axial direction.

Abstract: An in-line access door comprising an inner door for covering and sealing a duct opening, the inner door comprising a hole for receiving a fastener, the fastener engageable with a stud, the stud fixedly attached to the duct, an outer door, a releasable snap fastener for attaching the outer door in a fixed position relative to the duct, an insulating member disposed between the inner door and the outer door, and a gasket disposed between the inner door and the duct for sealing the joint between the inner door and the duct.

Abstract: To flash a hot gas vent pipe, representatively a chimney pipe, extending upwardly through a roof opening, a tubular sleeve having vertically extending spacer members interiorly secured thereto, with upper ends projecting above the upper sleeve end, is concentrically placed around the chimney pipe and anchored to the roof. A rubber boot is then placed around the sleeve and secured to the roof. Finally, a storm collar is downwardly telescoped onto the chimney pipe and rests on the upper end of the sleeve spacer members. Vertical cooling passages are defined between adjacent spacer member pairs, and through their interiors, and have upper exit portions communicating with the storm collar interior.

Abstract: To flash a hot gas vent pipe, representatively a chimney pipe, extending upwardly through a roof opening, a tubular sleeve having vertically extending spacer members interiorly secured thereto, with upper ends projecting above the upper sleeve end, is concentrically placed around the chimney pipe and anchored to the roof. A rubber boot is then placed around the sleeve and secured to the roof. Finally, a storm collar is downwardly telescoped onto the chimney pipe and rests on the upper end of the sleeve spacer members. Vertical cooling passages are defined between adjacent spacer member pairs, and through their interiors, and have upper exit portions communicating with the storm collar interior.

Abstract: A sprocket, gear or pulley having an interchangeable peripheral portion for replacement. The device has a hub with an axial boss, an annular member having teeth or a groove along its outer rim and located concentrically on the boss, and a cap to hold the annular member immovable on the boss. The annular member may be segmented. The inner rim of the annular member and the boss may be threaded or splined for interengagement.

Abstract: A sprocket having interchangable teeth, in which a chain is removably mounted circumferentially on the peripheral edge portion of a hub, with means to key the chain both longitudinally and laterally on the edge portion of the hub. Each link of the chain carries one or more teeth which project radially outward with respect to the hub.