16x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack house and garden soil Opening roof top can slide

Opening roof top can slide out or lift up to prevent overheating

It is ready to be combined with a CMh 315W ceramic metal halide lamp (not included) and the Xtrasun XTE3150 CMh 315W digital ballast (not included)

This fan wall shutter is specially made to be used in applications such as grow rooms

and breaks down protein and organic matter

Designed specifically for electronic ballasts

16x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack house and garden soil Opening roof top can slideNordic 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