Our Accumulair brand 13x21x4 air filter is solely engineered to be a replacement for same sized 13x21x4 air filter style. Pleated electrostatic charged filter material traps contaminants relative to its ASHRAE MERV rating. Chemical free material. Notice: Sample filter image shown is not the actual dimensions and is included to show design purposes only. Catalog and 13x21x4 air filter statements last verified on 03/24/2020.
Shipping and Returns
- 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.