Description
12x27x1 Exact MERV 7 AC Furnace Filters 6 Pack veg and bloom The 25u offers smaller holes The 25u offers smaller holes and gives you a more filtered and refined product where the 150u has larger holes that allows material to pass through easier and can potentially provide slightly higher yields Nordic Pure 10x20x1 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer