Abstract: A clamping bracket means for use with lateral and vertical film supporting rails for defining a film enclosure of finite length, and having a facility for quick-connect and quick-disconnect action. The clamping bracket means includes a pair of opposed brackets arranged to be retained together to form a clamping jaw, with the jaw portion being fitted with a split sleeve of resilient material for enclosing and grippingly retaining a flexible film member upon a film supporting rail, with the split sleeve extending beyond the edges of the jaw.

Abstract: A crop-drying system utilizing a conventional crop or grain confining bin having means for delivering drying air to the grain retained within the bin. A solar pre-heat chamber is utilized to deliver pre-heated air to the impeller, with the solar pre-heat chamber comprising an elongated tubular structure having bottom, side and top walls, and wherein the bottom wall is an opaque, highly absorbent flexible film, with the side and top walls being transparent, highly transmissive flexible films. The pre-heat chamber is coupled to an air inlet chamber, with normally closed vents being provided for responding to a clogged condition to the normal inlet port of the inlet chamber.