Home > Shop > Heating & Ventilation > Furnace Filters Furnace Filters DUSTSTOP 16x25-1" FURNACE FILTER 3pk Item #: 27157935 $5.10 ea. Add to Cart DUSTSTOP 20x20-1" FURNACE FILTER 3pk Item #: 27159840 $5.10 ea. Add to Cart DUSTSTOP 20x25-1" FURNACE FILTER 3pk Item #: 27161745 $5.10 ea. Add to Cart 3M 16x25-4" 1000 MPR FURNACE FILTER Item #: 27165555 $38.10 ea. Add to Cart 3M 20x25-4" 1000 MPR FURNACE FILTER Item #: 27167460 $38.10 ea. Add to Cart 3M 16x25-5" 1000 MPR FURNACE FILTER Item #: 27167594 $38.10 ea. Add to Cart 3M 20x25-5" 1000 MPR FURNACE FILTER Item #: 27167649 $38.10 ea. Add to Cart Page of 2