15x23x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack cloning-&-seed-starting HPS grow room glasses are

HPS grow room glasses are the go-to optical tool for indoor and outdoor growing under high pressure sodium lights

such as the APCL4240

Perfect for large garden installations

For vegetative growth

15x23x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack cloning-&-seed-starting HPS grow room glasses areNordic 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