"Prefilters for use with Port-A-Cool Item# 250797. Prefilters help keep airborne contaminants from clogging the Kuul pads cooling media. Filter system catches most foreign particles before reaching cooling pads and prevents air flow restriction and possible damage to the unit from heavily contaminated filters prior to replacement. U.S.A. Material Type PVC frame and 3.3 micron filter media, Dimensions L x W x H in. 17 1/2 x 27 3/16 x 6 1/2, Compatible With Item Number s 250797, Filtration Microns 3.3 per sq. yard, Accessory Type Port-A-Cool accessory. Works with Northern Item# 250797 U.S.A."
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