Aprilaire 1310 Whole House Air Purifier, Economic Furnace Filter w/MERV 11 Filter - 20 x 20" Model 1310 is a whole home air cleaner Unit operation is completely silent Only maintenance required is replacement of the disposable media Outer housing is heavy gauge, preassembled galvanized steel Self-aligning painted door easily snaps into place every time Cabinet and media are UL classified Narrow 6.75"" cabinet for easier installations and more flexible applications Prevents dust build up Maximizes the life of your heating and cooling equipment Improves energy savings Produces no ozone be