Our Accumulair 21x21x4 air filter is solely engineered to be compatible with same sized 21x21x4 air filter type. Pleated electrostatically charged filter media traps airborne contaminants according to the MERV standard rating. Free of chemicals. Note: The example filter picture displayed is not to scale and is shown for style only. Catalog and 21x21x4 air filter variations are up to date as of 03/24/2020.
Shipping and Returns
- Shipping is FREE to the contiguous United States.
Due to shortages and demand the current lead time is up to 10 business days to process.
Orders take 1-3 business days to process.
(Custom & bag filters take 5-7 business days.)
Delivery normally takes another 1-3 days depending on location.
- 30-day 100% return policy.
Payment & Security
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