11_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack HPS Bio·Heaven™improves the performance and quality

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

Ceramic Metal Halide lamps were not designed for horticulture applications

Fortified with six trace elements plus humic acid and Norwegian kelp extract to help produce heavy weight flowers and buds

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

Each of these machines feature 11 Toro-hardened steel blades on the cutting reel

11_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack HPS Bio·Heaven™improves the performance and qualityNordic 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