14_1/2x19x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Reflective & Greenhouse Films Potassium Sulfate

Potassium Sulfate

leading to stronger plants

The sampling assembly provides a stable method to mount the pH and temperature sensors

Citrus Blackfly (Aleurocanthus woglumi)

14_1/2x19x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Reflective & Greenhouse Films Potassium SulfateNordic 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