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.
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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