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An external baffle creates low pressure over the vent openings to pull air from the attic and deflects wind and weather over the vent to help protect the attic from rain and snow infiltration
easier sanding
Rip fence for straight
Universal Snap-Lock Plus mandrel system fits all hole saws in the range
Flanders NaturalAire 20 In. x 30 In. x 1 In. MERV 4 Trimmable Air Filter Durastall An external baffle creates lowCut to fit, washable air filter for furnace or central air. Replaces panel type filters. Made of synthetic materials that do not support the growth of odor causing microbials. This rigid filter is self supporting and needs no frame. Traps dust lint, dust mite debris, pollen, mold spores. Washable
