21x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack Ventilation FOR WINDOWS VISTA & 7

FOR WINDOWS VISTA & 7 USERS

Purchase this replacement sensor for your Oakton Low/High/EC High tester and keep your instrument running in the most efficient shape possible

Produces ozone using ultra violet light bulb

• Necessary for chlorophyll formation

| Airflow: 1201 CFM | Noise: 48 dBA | Bearings: Dual Ball

21x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack Ventilation FOR WINDOWS VISTA & 7Nordic 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