"Prefilters for use with Portacool 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. Material Type PVC frame, 3.3 micron filter media, Accessory Type Filter, Compatible With Item Number s 250797. Works with Item# 250797"
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