Abstract: A ceiling vent to reduce the temperature in a room that is subject to becoming uncomfortably hot. The vent contains two concentric tubes, one movable and the other stationary. The movable tube is attached to a damper plate so that when the movable tube is lowered, the vent opens. Attached to the stationary tube is a plastic fuse pin in a metal sleeve that engages a notch in the stepped upper portion of the movable tube. There is a spring attached at one end to the metal sleeve and at the other end to the damper plate. When the vent is opened, the spring is stretched. Should there be a fire in the room being vented, hot air rising through the vent would cause the plastic fuse pin to soften or melt, which would cause the plastic fuse pin to disengage from a notch and allow the spring to resume its rest position and close the vent.

Abstract: A thermal window shield has been designed for reducing heat losses in window structures made from metal, and particularly useful for thermally shielding Jalousie windows. The thermal window shield has a thermal frame made from poor transmitting material, and secured to the metal window frame by appropriate means. For example, the thermal frame may be secured to the metal window frame by adhesive or by a foam tape. In lieu of the foam tape, the thermal frame may be provided with spacing means in the form of protuberances which establish a space between the thermal frame and the metal frame to thereby provide a thermal air barrier. The thermal frame supports a thermal pane which is slidably and removably secured so that it can be readily removed for venting purposes when the Jalousie window is opened.