Our Accumulair 16x21x4 air filter is specifically made to be compatible with similarly sized 16x21x4 air filter style. Pleated electrostatic charged filter media traps contaminants in the air relative to its MERV standard rating. Chemical free. Note: Example filter image displayed is not the actual dimensions and is shown for style purposes only. Database and 16x21x4 air filter statements last updated on 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, and up to 24 days for non-standard, 0.5" , and bag filters.
Delivery normally takes another 1-3 days depending on location.
- 30-day 100% return policy.
Payment & Security
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