Abstract: Radiation shielding for limiting the transfer of heat by radiation is provided for a ceiling closure having a curtain wall shiftable from an open position allowing air flow through an opening in the ceiling to a closed position in which the curtain wall blocks air flow through the opening. The radiation shielding comprises a plurality of radiation shields formed of air impermeable, heat resistant, flexible fabric sheets folded for storage and for unfolding into generally planar sheets with shifting of the curtain wall into the closed position wherein the fabric sheets define and confine a dead air space. The sheets are preferably made of tightly woven asbestos coated to retain asbestos fibers against liberation into an air stream. Reflective coatings act to retard the radiation of heat.

Abstract: A combination grill, air damper and fire damper is provided with a means for adjusting the volume of flow of air through the damper.

Abstract: An air control apparatus is provided comprising a frame housing a plurality of extendable metal curtains spaced from one another in parallel planes, said curtains being extendable between a folded open condition and an unfolded closed condition.

Abstract: A fire-extinguishing apparatus for a use inside a building wherein a cloth curtain is used to shut off a burning area from a non-burning area, and wherein a support is provided for suspending and winding up the cloth curtain, and a water feeder supplies water continuously to the cloth curtain over the entire length of the width direction at the upper end so that the whole surface of the cloth curtain is covered by the water flowing thereon from the upper end to the lower end.

Abstract: A folding blade damper comprising a rectangular frame and an assembly of blades hingedly interconnected along longitudinal marginal edges by tubular hinge elements. A spring is interposed between each interconnected pair of blades to resiliently urge the blades from a folded to an unfolded flow blocking position across the frame. The spring comprises a flat member having an arcuate portion generally coaxially of the tubular hinge elements and oppositely extending arms in overlying engagement with adjacent blades with fingers extending over an edge of a respective blade to engage the opposite face thereof and cooperate with the arms to resiliently and removably secure the spring to said blades whereby the arcuate portion is contracted upon folding of said pair of blades and then exerts a torque urging the connected blades to unfolded position.