20x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Lamps It is held firmly in

It is held firmly in place using magnets

Use this method and place your cuttings back in the tray/insert for 48-72 hours

the increased PAR output of the Lucalox™ PSL lamp best simulates natural daylight to maintain plant growth under artificial lighting conditions

using modern automated fertigation methods

lamp failure protection

20x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Lamps It is held firmly inNordic Pure Custom MERV 14 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