Our Accumulair 16.5x21x4 air filter is solely made to be compatible with same sized 16.5x21x4 air filter specs. Pleated static charged media captures airborne particles according to the ASHRAE MERV rating. Material is free of chemicals. Note: The example filter image shown is not the actual dimensions and is displayed for style purposes only. Catalog and 16.5x21x4 air filter variations last verified on 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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