Filter Hut's Accumulair brand 16x21.5x4 air filter is solely engineered to replace same sized 16x21.5x4 air filter specs. Pleated electrostatically charged filter media captures contaminants in the air relative to its ASHRAE MERV rating. Chemical free material. Notice: Example filter image shown is not to scale and is shown for design purposes only. Current stock and 16x21.5x4 air filter variations are up to date as of 03/24/2020.
Shipping and Returns
- Shipping is FREE to the contiguous United States.
- Our current lead times are 3-5 days for stocked standard filters, up to 3 weeks for non-standard and 0.5" filters, and up to 8 weeks for bag filters.
Delivery normally takes another 1-3 days depending on location.
- 30-day 100% return policy.
Payment & Security
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