28x36x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack flowering 【High Efficiency】Adopt the latest high-quality

【High Efficiency】Adopt the latest high-quality Samsung LM301B LEDs with high energy efficiency

reducing the buildup of plant waxes

Ideal spectrum for flowering

Outside Dimensions: 35 3/4" x 35 3/4" x 3 3/4"

and for measuring samples at cold temperatures

28x36x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack flowering 【High Efficiency】Adopt the latest high-qualityNordic Pure Custom MERV 13 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