Overview for Gray Flex 5-4GF-6
Gray Flex's models MH(R-4.2), MH-6(R-6.0), and MH-8(R-8.0) 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, foot markers, size and performance data every 24-(Foot markers every 12 inches). It is jacketed with a heavy duty black polyethylene vapor barrier which meets the HUD requirements for outdoor mobile home or modular home applications. The airtight core is our exclusive patented, reinforced inner liner. Fiberglass insulation is a minimum of 1 1/4 thick for MH, min. of 2 inches for MH-6, and min. of 2 5/8 for MH-8.