16_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Extension Increased aeration and more drainage

Increased aeration and more drainage allow gardeners to more aggressively feed without worrying about overwatering

great for your bottom line

one must ensure that the Ca and Mg you are feeding your garden is derived from high quality source materials

Shipping Weight - 23LBS

greenhouse planting and hydroponics etc

16_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Extension Increased aeration and more drainageNordic Pure Custom MERV 12 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