28x36x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack commercial-greenhouse-fixtures Use this tester for either

Use this tester for either cup-style or dip-style measurements

6' grounded cord with on/off switch

Bud Booster also contains added boron (B) and nitrogen (N)

Contains 60% nitrate nitrogen

Evening or very cloudy conditions are the best time to apply

28x36x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack commercial-greenhouse-fixtures Use this tester for eitherNordic 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