13x23x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_dakine420 Roots Organics CalMag is a

Roots Organics CalMag is a pure and all natural blend of calcium

Only 1200 watt rated HPS lamp in the industry

voted High Times Magazine product of the year for three years running

emery cloth

Humidity: 5% to 90% RH

13x23x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_dakine420 Roots Organics CalMag is aNordic Pure Custom MERV 10 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