Our Accumulair 19.75x21x4 air filter is exactly constructed to substitute for similarly sized 19.75x21x4 air filter specs. Pleated electrostatic charged media traps airborne particles according to the MERV rating. Chemical free material. Notice: Example filter image as shown is not the actual dimensions and is included to show style purposes only. Catalog and 19.75x21x4 air filter statements current 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).
Delivery normally takes another 1-3 days depending on location.
- 30-day 100% return policy.
Payment & Security
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