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HVAC FitterTHE PART THAT FITS

Air filters

The size is printed on the edge of your old filter, like 16x25x1. Match all three numbers.

  1. 1Length x width: match the size on the frame
  2. 2Depth: must match the slot: 1, 2, 4 or 5 in
  3. 3MERV: pick what your system can handle

Filter by spec

NOMINAL SIZE
MERV
MATERIAL
21 parts
Numbers rubbed off your old part?

Send us your unit's model number and a photo of the plate. A real person will find the part for you.

Ask us to find it

Nominal size

The size on the label is rounded. A 16x25x1 filter really measures about 15.5 x 24.5 x 0.75 in. That is normal.

Airflow arrow

Point the arrow toward the furnace or air handler, away from the return duct.

How often

Check a 1 in filter every month. Most need a change every 1 to 3 months. Read the guide.