18x27x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack 9 CFM Research Facilities – Six spectral

Research Facilities – Six spectral options allow scientists to isolate specific wavelength effects on plant morphology

provides a good base for fast root development and decreases the number of times you need to water compared to clay pebbles

Try the Stimulant Pack

Outlets are available in 1/2 inch (13 mm)

capable of adding up to 1

18x27x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack 9 CFM Research Facilities – Six spectralNordic Pure Custom MERV 13 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