18x27x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Odor Control ●【High Reflective&Noise Free-fanless light boards

●【High Reflective&Noise Free-fanless light boards design】will make your growing life easy and quiet

On the back side are four USB fan ports

which may aid in the uptake of micronutrients

is UL listed and you will never have to change a bulb again

18x27x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Odor Control ●【High Reflective&Noise Free-fanless light boardsNordic 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