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Some equipment requires either normally open or normally closed contact closure in order to activate the equipment
Constructed with a polyethylene base
• Smaller
leading to stronger root growth
21x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack reflective-and-greenhouse-films Some equipment requires either normallyNordic 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