23_3/4x23_3/4x1Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack fans-ventilation-ducting the root zone and surrounding

the root zone and surrounding soil

Made in Germany and engineered in a ISO 9001 certified facility

enhancing both plant growth and flowering

“Absolutely essential for our greenhouse trials

PPF: 1700 µmol/s

23_3/4x23_3/4x1Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack fans-ventilation-ducting the root zone and surroundingNordic 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