21x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Garden Hygiene and Safety Manufactured from HDPE with UV

Manufactured from HDPE with UV Protection

The reels on these machines are 5” in diameter and 21″ in length

pets or wildlife (when used as directed)

The HI98331 Soil Test™ is a pocket tester specifically designed to directly measure soil conductivity (EC) and temperature

Less Transparent than 6 mil Greenhouse Plastic (More Difficult to See Through)

21x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Garden Hygiene and Safety Manufactured from HDPE with UVNordic 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