24 1/2x27x1 Trane ReplacementMERV 10 Plus Carbon AC Furnace Filters 6 Pack pest-and-disease-control Possibly the strongest REUSEABLE duct

Possibly the strongest REUSEABLE duct on the market with a cost similar to the leading competitor's regular 3-ply duct

Features: Low frequency

messy gypsum or insoluble pH raising carbonate required

all-natural and organic ingredients containing an optimum air-to-water ratio for superior growth rates and yields over conventional potting soils

Rapid Release: Mites emerge 3-5 days after application of Rapid Release sachets

24 1/2x27x1 Trane ReplacementMERV 10 Plus Carbon AC Furnace Filters 6 Pack pest-and-disease-control Possibly the strongest REUSEABLE ductNordic Pure 24 1 2x27x1 Trane Replacement MERV 10 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: