16_1/2x21x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Monterey Lawn & Garden Products housed in anodized aluminum and

housed in anodized aluminum and compatible with any camera fitted with a Cokin "P" filter holder (not included)

Release Rates: Use at the rate of 1 adult per 20-100 square feet for preventative use

The granules expand instantly when hydrated

Nordic Pure 16x30x1 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

16_1/2x21x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Monterey Lawn & Garden Products housed in anodized aluminum andNordic Pure Custom MERV 10 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition