"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. Accessory Type Port-A-Cool accessory, Compatible With Item Number s 250797, Material Type PVC frame and 3.3 micron filter media, Filtration Microns 3.3 per sq. yard, Dimensions L x W x H in. 17 1/2 x 27 3/16 x 6 1/2. Works with Northern Item# 250797 U.S.A."
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