4″ x 12″ 20 PACK Compatible Charcoal Carbon Microwave Filters US
Description Carbon Register Vent Air, Odor & Dust Filters 12″ x 4″ by CFS HVAC Furnace Register Vent Charcoal Carbon Pre-Filter Pads 12″ x 4″ Activated Carbon Register Vent Filtration . Has a activated charcoal impregnated in a poly mat to help trap dirt, dust, smoke, pollen sized particles and reduce odor through furnace/AC registers. Keeps dirt & objects from falling into ducts. .