Keep your air purifier's first line of defense against air borne particles running at its best with this Hunter HEPAtech Model 30901 Replacement Pre-Filter. Made specifically to fit your Hunter air purifier system, this incredible filter captures 99.97% of all airborne particles as small .3 microns from the air that pass through the system. It even reduces odors from repeat offenders such as tobacco smoke, cooking, pet and general household odors. Hunter HEPAtech Replacement Pre-Filter 30901 Features: Lightweight easy to change drop in filter Measures approx. 28-1/4"L x 15-3/4"W x 3/25"H Made of activated carbon filter material Made in Mexico Pre-Filter 30901 Fits Hunter Purifier Models: 30023, 30057, 30059, 30067, 30078, 30079, 30090, 30095, 30105, 30115, 30117, 30119, 30124, 30130, 30145, 30170, 30175, 30185, 30210, 30212, 30213, 30214, 30215, 30216, 30225, 30240, 30241, 30244, 30245, 30251, 30260, 30378, 30379, 30381, 30382, 30398, 30400, 30401, 30402, 30706, 30710, 30711, 30713, 30715, 30716, 30717, 30730, 30735, 30736, 30750, 30755 and 30756