8_7/8x19_1/8x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack BVV Simultaneous display of pH

Simultaneous display of pH

The Ceramic HPS can take up to 20 minutes to get to full power

outdoor activities

When used as a foliar spray in the first weeks of flowering

8_7/8x19_1/8x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack BVV Simultaneous display of pHNordic 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