18x36x1 Furnace and AC Filters

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All orders are shipped for free in the US. Excluding Alaska, Hawaii and Canada.

Filter Fit Guarantee™

Need to return your filters due to a measuring mishap? Our Filter Fit Guarantee™ has you covered.

Phone Support

Need help? Please call customer support at: 1-866-469-8556

What is MERV?

The filter industry standard system that rates the overall effectiveness of air filters. Learn more