21x23_1/2x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack pest-and-disease-control PfrSpec: 1

PfrSpec: 1

NOTE: This cover will only fit the newest style Radiant 6" fixtures

Measuring table allows you to track feed quantities and plants needs

low PPM additive

Fully sealed commercial designed ballast featurning Soft Start and Random Start Technology

21x23_1/2x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack pest-and-disease-control PfrSpec: 1Nordic Pure Custom MERV 14 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