21_1/4x23_1/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Reflective & Greenhouse Films They reliably warm the root

They reliably warm the root zone to 10ºF-20ºF above ambient air temperature

No fans No noise LED Grow System design will make your growing life easy and quiet

Model / Finish - 333200 / Opaque White + Blue

Wireworm (Mult

Nordic Pure 20x20x4 Pleated Air Filters MERV 15 are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home

21_1/4x23_1/4x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack Reflective & Greenhouse Films They reliably warm the rootNordic Pure Custom MERV 8 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