Abstract: A fixed blade air mixing apparatus is characterized in particular by having a plurality of radially extending vanes which extend away from a common center and terminate at their outer ends in a generally polygonal shaped enclosure. The apparatus is principally intended for use in eliminating stratification of airstreams of different temperature flowing through a common passage, for example, in a heating, air conditioning or other ventilating duct, and the vanes are so constructed and arranged as to establish a predetermined discharge angle of the airstreams passing therethrough which when combined with a predetermined lateral clearance between the vanes will establish optimum mixing effectiveness and uniform velocity profile of the air downstream of the mixing apparatus with a minimum pressure drop as the air flows through the apparatus.

Abstract: Modular collector panels are adapted for flush or recessed mounting on a pitched roof, or may be installed on a flat roof by means of a mounting frame, the panel sections being interconnected in side-by-side relation to one another by a unique form of side and end wall connector assembly which serves to interconnect the panels in sealed relation to one another to the roof or other housing as well as to support and house the component parts of the panel section including the glazing, absorber plate and insulating layer in unitary relation to one another.