16x28x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack nutrients and supplements Every model is built for

Every model is built for direct connection in-line with standard diameter round ducting

the system efficiently cools rooms holding various audio video components and equipment

or general plant production

Elite 91 SILICIC ACID is suitable with all soil

16x28x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack nutrients and supplements Every model is built forNordic Pure Custom MERV 12 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