11_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack HPS The increased PAR creates larger

The increased PAR creates larger plant mass as well as better seedling growth

giving your plant the ability to access the nutrients they need at the critical times of flower formation to ensure massive growth and enhanced aromas

Bio·Heaven™improves the performance and quality of the crop

storage rooms

Directs light down in a focused pattern

11_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack HPS The increased PAR creates largerNordic 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