Abstract: A dryer vent box and method is provided which addresses the problems inherent in conventional dryer vent assemblies. The dryer vent box includes upper and lower mating substantially rectangular housings which are dimensioned to be received within the confines of a conventional 2.times.4 studded wall. Each of the upper and lower rectangular housings have a protruding cylindrical flange with an opening into the housing to provide for the intake and exhaust of dryer exhaust gasses. The upper housing section includes at least one tab extending from one of the sides thereof to provide for the attachment of the upper housing to the wall. The lower housing includes cutoff markings or indicators which provide for the correct placement of the cylindrical flange of the upper housing relative to the dryer outlet. Thus, the dryer vent box of the present invention provides an aesthetically pleasing, effective, efficient and improved dryer venting assembly.

Abstract: A structure or cooling a large cylindrical storage tank has the shape of an inverted funnel and is intended to be disposed over the tank receiving the upper portion therein and internal struts are provided to separate the funnel wall from the tank wall, The separation allows the entry of air into the funnel structure so that as the structure is heated by the sun air currents will rise through the funnel exiting the chimney which will result in an inflow of air into the funnel around the walls of the tank.

Abstract: A system for containment of heavy vapor cloud and aerosol from a potential source of hazardous vapor comprising walled surfaces surrounding the vapor source and a roof above the vapor source and forming with the walled surfaces an enclosure for the vapor source. The roof is porous with openings therethrough dimensioned for minimizing wind shear and extending over at least about 20% of the surface area of the roof, and a device is located within the enclosure for absorbing the vapor.

Abstract: A method of installing a ventilation device through existing plywood door closures of accesses to attic spaces with roof fans in homes includes a frame with louvers across a central opening closed by two doors hingeably attached to be opened and closed with a hook rod interconnecting with eye bolts on the doors, the entire device being insulated to reduce heat loss during the cooler seasons.

Abstract: A ventilation apparatus, which is installed in the ceiling of a room, particularly a kitchen, laundry or the like. The ventilation apparatus (1) comprises a wall element (3) directed downwardly from the ceiling, which wall element is formed of a number of elongated parts (4) provided with vertical chambers (5). The shells (6) of the parts (4) are provided with inlet apertures (7), through which apertures and chambers the exhaust air is conducted out of the room.

Abstract: A liquid spill containment system inserted into an open airflow structure such that minimum interference with existing airflow occurs while simultaneously directing liquid spill particles into spill containers. A deflector is located below an upper partition portion of the open airflow structure. Spill containers are positioned below the deflector. The deflector and containers are located with respect to each other such that liquid particles coming through the open airflow structure are directed by the deflector into a container while, simultaneously, airflow entering the open air structure is exited unimpeded.