Abstract: A portable, positive pressure fan for fire fighting provides a three-leg frame with a platform supporting the fan and its driving engine. The platform carries two forward, laterally spaced collars and one rearward collar to adjustably receive the three legs for support spacedly above a supporting surface. The legs are adjustably positionable in the collars to allow vertical adjustment to regulate fan height and angulation relative to a supporting surface, have an arcuate configuration and are somewhat resilient to absorb and damp operative forces, and the leg array alleviates or negates walking of the structure on a supporting surface caused by vibrations resulting from operational forces. The fan has a blade with diametrically opposed lobes of the aircraft propeller type to create a narrow cone of pressurized air and preserve as great a volume and velocity of such air as possible at ordinary operating distances.

Abstract: A heat transfer measuring apparatus for a windowpane of a room includes a body portion defining an internal chamber with one open end adapted to fit against the inside surface of a windowpane. Within the chamber, which is thermally insulated from the ambient temperature conditions of the room inside such window is a temperature sensing element for measuring the temperature within the insulated chamber. A shield portion is positioned within the apparatus at a location between the temperature sensing element and the window opening. The shield permits air transfer for transmission of thermal energy from such a windowpane into the chamber area where the temperature sensing element is located, but limits the direct transmission of solar or other radiant energy through such window against the temperature sensing element.