Gray Flex’s flexible ducts are tested in accordance with U.L. 181 and approved for use as a Class 1 air duct material. Jacketing is printed with certification label, size and performance data every 24". Foot markers are provided every 12". Black flexible duct is manufactured from black polyethylene and comes in three R-Values; R-4.2 (GF), R-6.0 (GF-6), and R-8.0 (GF-8). Black flexible duct comes with our exclusive patented air tight, reinforced inner liner core. Black flexible duct is available in standard sizes from 4" to 20", in lengths of 25’ or 50’. Black flexible duct is designed for indoor use only. Visit our web site or contact us for Specification Sheets.
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