11x32_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack HPS Connect them to your fan

Connect them to your fan and ducting and reduce your noise output by up to 25dba without reducing airflow

making it best for flowering periods

removes lint

Apply directly to actively growing weeds during warm

2012HL Growing Supplies

11x32_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack HPS Connect them to your fanNordic 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