21x27x1 Trane Replacement MERV 13 Plus Carbon AC Furnace Filters 6 Pack HPS 24W puts out 2000 initial

24W puts out 2000 initial lumens per tube

Speeds uptake and distribution of essential macro- and micronutrients required for all plant metabolic functions and growth

Half-Note / Double-Note / Chain-Note Detection

SPHINX was designed for licensed producers (cultivators) to address the unique air quality needs of the grow market

21x27x1 Trane Replacement MERV 13 Plus Carbon AC Furnace Filters 6 Pack HPS 24W puts out 2000 initialNordic Pure Trane Replacement 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