Filter Hut's Accumulair brand 18x20x4 air filter is specifically engineered to replace similarly sized 18x20x4 air filter specification. Pleated static charged filter media traps contaminants relative to its MERV standard specification. Material is free of chemicals. Note: Sample filter image as shown is not the actual dimensions and is included to show style purposes only. Catalog and 18x20x4 air filter statements current as of 03/24/2020.
Shipping and Returns
- Our current lead times are 10-14 business days for standard filters (1"-6" thick sizes), and up to 14-21 business days for made-to-order filters (non-standard and 0.5" sizes). Delivery normally takes another 1-3 days depending on location.
- Shipping is FREE to the contiguous United States.
- 30-day 100% return policy.
Payment & Security
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