17_1/8x26_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack books and size options

and size options

and in conjunction with Rootech Cloning Gel

Staphylococcus aureus

this is the high quality premium nutrient line that professional gardeners trust

17_1/8x26_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack books and size optionsNordic 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