The right filter size,
delivered.
Pleated replacement air filters for furnaces and AC systems, in multi-packs that last a season or a year. Free US shipping, 30-day returns.
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Two sizes in your home? Bundle and save 5%
Many homes have two returns or two systems. Pick both sizes and get two 6-packs together.
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How to find your size
Look at the cardboard edge of the filter you have now. The nominal size is printed there, width × height × depth in inches, like 16x25x1. Match it exactly. MERV 8 suits most homes; higher ratings capture finer particles but check that your system supports them.