"Prefilters for use with Port-A-Cool Item#s 250787, 250788 and 250795. 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, Filtration Microns 3.3 per sq. yard, Compatible With Item Number s 250787, 250788, 250795, 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. U.S.A"
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