13x23x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack tents-&-tarps thumb and finger loops are

thumb and finger loops are included to help prevent sleeves from riding up

and so do your favorite plants

3-Year Warranty – HLG stands behind the BlackBird with a full 3-year manufacturer warranty

RETURNS: Custom AC furnace air filters are not returnable since we hand make them per your exact dimensions when you enter your air filter size above

SNS-604A and SNS 604B are each one-part nutrient additives to be used throughout the plants growing and flowering cycle

13x23x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack tents-&-tarps thumb and finger loops areNordic 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