11_1/2x11_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack growing-media Features glass pH sensor and

Features glass pH sensor and reference tube and thermister

• -40º F—good for colder applications

Handles for easy moving

• Chlorophyll A

8 Bag Extractor Bag Kit is the most advanced on the market

11_1/2x11_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack growing-media Features glass pH sensor andNordic 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