15x24x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Growing Media A calcium deficiency also reduces

A calcium deficiency also reduces thickness of leaves and interferes with proper transpiration

0-8560 ppm

reducing fly populations across large areas

Weevils (including Boll Weevil

Six-way wattage output control: 400W

15x24x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack Growing Media A calcium deficiency also reducesNordic Pure Custom MERV 7 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