Patent ID: 6221120
Filing Date: 2001-04-24
Classification: B01D,F24F,F28F

Abstract:
A removable and cleanable screen guard for protecting a fin-coil heat exchanger from filter forming debris consisting essentially of cottonwood seeds without restricting an air flow rate through the fin-coil heat exchanger, the screen guard comprising:a flexible, wide mesh screen having a perimeter, an attachment surface an outward surface, a first plurality of filaments extending in a first filament direction, a second plurality of filaments extending in a second filament direction transverse to the first filament direction, the first plurality of filaments intersecting the second plurality of filaments to create openings therebetween, wherein there are approximately eight filaments per inch in the first filament direction, and approximately nine filaments per inch in the second filament direction, the opening being sized to prevent substantially all cottonwood seeds from passing through the openings and being sized to permit substantially all dirt and dust to pass freely through the openings, anda flexible attachment strip fixed directly to the attachment surface of the flexible screen around substantially the entire perimeter for removably securing the perimeter of the screen to the fin-coil heat exchanger.