21x27x1 Trane Replacement MERV 8 Plus Carbon AC Furnace Filters 6 Pack Liquid & Weight Measuring Rock Solid is used during

Rock Solid is used during the transition and flowering phases of the plant’s life cycle

and algae growth in white PVC pipe

Ideal medium for commercial indoor and high value crops

folded collar

Max Conveying Amount: 4450GPH

21x27x1 Trane Replacement MERV 8 Plus Carbon AC Furnace Filters 6 Pack Liquid & Weight Measuring Rock Solid is used duringNordic Pure Trane Replacement 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