This Filter Hut Accumulair 21.25x21.25x4 air filter is solely built to replace same sized 21.25x21.25x4 air filter type. Pleated electrostatically charged filter material traps airborne contaminants according to the MERV rating. Chemical free material. Notice: Example filter image as shown is not the actual dimensions and is displayed for design purposes only. Current stock and 21.25x21.25x4 air filter variations last verified on 03/24/2020.
Shipping and Returns
- Our current lead times are 6-8 business days for standard filters (1"-6" thick sizes), and up to 10-14 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.
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