12_3/4x20_3/4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack reflectors and grow lights Highly compatible with organic integrated

Highly compatible with organic integrated pest management programs

Indoor Crops: Use 8-16 fl

This sensor will measure air temperature

so it does not have to be mixed with a "spreader-sticker" like the gallon size

12_3/4x20_3/4x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack reflectors and grow lights Highly compatible with organic integratedNordic Pure Custom MERV 10 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