21_1/2x23_3/8x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Environmental Controllers How do I know when

How do I know when to replace the filter

safely removes pesticide residues and other contaminants

Dual Temperature Sensors – Monitor temperature in both control zones and trigger overheat protection automatically to safeguard your equipment and plants

Nordic Pure 16x24x1 MERV 13 Plus Carbon air filters are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that attracts and capture most airborne particulates in your home

Retail & Wholesale Distribution – Protect product quality during storage and transit from processor to retailer to end consumer

21_1/2x23_3/8x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Environmental Controllers How do I know whenNordic 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