Inlet and damper system for airhouses

In apparatus for supplying air to the interior of a building, an enclosure, a first inlet to the enclosure in communication with the outside atmosphere for admitting outside air to the enclosure, a second inlet to the enclosure in communication with the interior of the building for admitting building return air to the enclosure, fan means operable to draw air into said enclosure through said first and second inlets and direct the air drawn into the enclosure into the interior of the building, and means adjustably coordinating the flow of air through said first and second inlets to admit a substantially constant volume of combined outside air and building return air to said enclosure in selected proportions, wherein the means adjustably coordinating the flow of air comprises first and second dampers in said first and second inlets, respectively, said first and second dampers being adjustable between fully open and fully closed positions and providing a substantially linear variation in air flow capacity therethrough from the fully open to the fully closed position, said first and second dampers comprising shear dampers, and said first and second shear dampers being of substantially equal air flow capacity.

An apparatus for supplying air to the interior of a building, an enclosure, a first inlet to the enclosure in communication with the outside atmosphere for admitting outside air to the enclosure, a second inlet to the enclosure in communicating with the interior of the building for admitting building return air to the enclosure, fan means operable to draw air into said enclosure through said first and second inlets and direct the air drawn into the enclosure into the interior of the building, and means adjustably coordinating the flow of air through said first and second inlets to admit a substantially constant volume of combined outside air and building return air of said enclosure in selected proportions, including an intake unit in communication with said enclosure through which ambient outside air is drawn into said enclosure, a chamber in said intake unit having an inlet, a burner assembly within the chamber for selectively heating ambient outside air drawn through the chamber, and damper means within the chamber inlet for selectively closing off said chamber against passage of outside air.

An apparatus for supplying air to the interior of a building comprising, an enclosure adjacent the building, an air intake unit on said enclosure for admitting ambient outside air to said enclosure, a first inlet in said air intake unit for admitting ambient outside air to said enclosure, a second inlet to said enclosure in communication with the interior of the building for admitting building return air to the enclosure, a burner chamber in said air intake unit for receiving ambient outside air and admitting the air to said enclosure, fan means operable to draw air into said enclosure through said first and second inlets and said burner chamber and direct the air drawn into the enclosure into the interior of the building, and means adjustably coordinating the flow of air through said first and second inlets and said burner chamber to admit a substantially constant volume of combined outside air and building return air to said enclosure in selected proportions.