Aprilaire #813 High Efficiency Filtering Media  - MERV 13 (2-Pack)

This highly efficient filter media fits common 20" X 25" Air Cleaners after they have been upgraded using the Aprilaire 4897 Upgrade Kit.   This kit upgrades air cleaner cabinets from Carrier, Honeywell, Lennox, Ultravation, General, Trion, and others.

NOTE:  This filter can only be used after your air cleaner is upgraded using the 4897 rails!

Benefits:

• Removes Mold Spores, Pollen, Dust Mites, Bacteria, Smoke from your air
• Descreases the amuont of contanminants which can cause sinus irritation, allergic reactions and asthma attacks
• Increases the life of your heating and cooling system
• Helps your heating and cooling system save energy by running at peak efficiency
• Filter change is fast and simple
• Filter "self-sealing" ends eliminates filter blow by
• Collapsible filter protected from damage  - a common problem with large "box" filters
• Saves space in your cramped mechanical room!  Compare collapsed dimensions of 4-1/4" X 4-3/4" X 27" with 20" X 25" X 5"!!

Replaces the following: