9x13x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack fluorescent-lighting Since 1991 the #1 additive

Since 1991 the #1 additive for hydroponics and soil gardeners world wide

Meets National Organic Production (NOP) standards

All metal gearing parts are heat-treated

000 per 1000 sq

tube can be shortened for various applications

9x13x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack fluorescent-lighting Since 1991 the #1 additiveNordic 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