MERV Rated Replacement Air Filter: AIRx Filters 20x25x4 (Actual: 19.38 x 24.38 x 3.63 in) MERV 11 air filter assures the effectiveness of your home HVAC system resulting to efficient heating ...

But, there's more you can do to help with overall furnace efficiency and, perhaps more importantly, your health. This one ...

In our lab tests, Furnace Filters, Air Conditioner Filters & Air Filters models like the HVC12020 Merv 11 are rated on multiple criteria, such as those listed below. Dust, pollen, smoke removal ...