Abstract: An insulated plenum box, such as a ceiling box or any other metal plenum box, for heating, ventilating and air conditioning (HVAC) duct systems is produced faster and cheaper than prior art devices by having insulation sprayed onto either the inside or the outside of the plenum box to match the R-value of the connecting insulated HVAC duct, saving time, labor, and cost for the end user by eliminating the step of insulating the plenum box at installation.

Abstract: A mechanical repelling system enables a user to repel down an outside of a building to escape the building. A single cable with a harness is wound through a double array of block and tackle rollers, including a transverse array of moving rollers and an aligned and paired array of fixed rollers. The moving array of rollers attached to a descent speed controlling damper piston with a cable return compression spring.

Abstract: A light activated exhaust fan including an exhaust fan disposed above a ceiling area within a building. The exhaust fan is disposed within a housing. The housing has openings within side walls thereof. The openings in the side walls have ducts extending outwardly therefrom. Outer ends of the ducts extend outwardly of the ceiling area for communication with rooms therebelow. The housing has an opening through an upper end thereof. The opening through the upper end has an exhaust vent extending upwardly therefrom. An outer end of the exhaust vent extends outwardly of the building. The exhaust fan is in communication with a power source. A pair of activation mechanisms are secured within the rooms. The activation mechanisms are in communication with an activation receiver of the exhaust fan.