Our Accumulair brand 21x22x4 air filter is exactly designed to replace similarly sized 21x22x4 air filter style. Pleated electrostatic charged filter media captures airborne substances according to the MERV standard specification. Free of chemicals. Note: Sample filter image displayed is not the actual dimensions and is displayed for construction only. Current stock and 21x22x4 air filter specs current as of 03/24/2020.
Shipping and Returns
- Our current lead times are 4-6 business days for stocked filters (standard 1"-5" thick sizes), and up to 8-12 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
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.