Our Accumulair 21.5x26x4 air filter is solely designed to be a replacement for same sized 21.5x26x4 air filter specs. Pleated static charged filter media traps contaminants according to the MERV specification. Free of chemicals. Notice: The example filter picture displayed is not to scale and is displayed for design purposes only. Catalog and 21.5x26x4 air filter statements are up to date 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
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.