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
- Shipping is FREE to the contiguous United States.
- Our current lead times are 3-5 business days for stocked filters (standard 1"-5" thick sizes), up to 3 weeks for made-to-order filters (non-standard and 0.5" sizes), and up to 8 weeks for bag filters.
Delivery normally takes another few days depending on location.
- 30-day 100% return policy.
Payment & Security
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