21_1/2x23_5/16x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Lighting With the Bluelab Guardian Monitor

With the Bluelab Guardian Monitor monitoring your crops 24 hours a day and with the ability to set high and low alarms

Ideal for Veg and Bloom

Replacement Tumbler Barrel Bubble Magic 1500 gram - 145 micron

The purchase of a full sized greenhouse is undoubtedly a very large financial investment

21_1/2x23_5/16x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Lighting With the Bluelab Guardian MonitorNordic 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