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
- Our current lead times are 10-14 business days for standard filters (1"-6" thick sizes), and up to 14-21 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
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