23_1/2x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Terp Derp 4-in-1 ( Temp & Humidity

4-in-1 ( Temp & Humidity & CO2 & Day Night ) Sensor: Max

Perlite #3 features large coarse particles which maximize nutrient uptake

shelves are removable for taller plants

clubbed antennae

Nordic Pure MERV 14 air filters work great in newer

23_1/2x23_1/2x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Terp Derp 4-in-1 ( Temp & HumidityNordic Pure Custom MERV 8 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