13x21_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Steel stake Accepts: Sodium 250W

Accepts: Sodium 250W

5 year warranty on ballast electrical components

The PhytoMAX-2 1000 uses only the highest-quality

Requirements:

Large - Case of 12 sleeves (12 units per sleeve)

13x21_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Steel stake Accepts: Sodium 250WNordic 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