28x34x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack spl-athena we have determined that the

we have determined that the best results with these biologically active media will be obtained by a smart combination of mineral and organic nutrients

saving you money on utilities and costly maintenance

Codling moth

Efficient integrated flange for 8" ducting

Maximizes your germination success and great for seedlings

28x34x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack spl-athena we have determined that theNordic 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