Quality Flex 04-GF* - Systems, Inc. - Black Insulated Flex R4.2 Bag, 04" X 25'

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Gray Flex's models GF(R-4.2), GF-6(R-6.0), GF-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"). It is jacketed with a black polyethylene vapor barrier.
The airtight core is our exclusive patented, reinforced inner liner.
Fiberglass insulation is a minimum of 1 1/4" thick for GF, min. of 2" for GF-6, and min. of 2 5/8" for GF-8.
  • Exclusive Patented inner core
  • Energy Efficient
  • Lightweight and flexible/Installs quickly
  • Compression packaged to less than 10% of its
    extended length for less storage and handling
  • Air tight inner core to insure no fiberglass contact with the air stream
  • Low maintenance scuff resistant polyethylene jacket
  • Thick fiberglass insulation helps prevent condensation
  • Easier to cut than a standard scrim reinforced product
  • Data printed on the jacket for ease of inspectors and installers

California residents: see Proposition 65 Warning


picture_as_pdf installation instructions

picture_as_pdf specification sheet

picture_as_pdf warranty document

Features and Specification

ERP ID 136696
Weight 5.000000
Maximum Temperature -20°F to 250°F (-28.8°C to 121.1°C)
Maximum Pressure Rated pressure: 10_ positive, 3/4_ W.G. negative per UL-181. Pressure rating is based on UL test procedure run at 2.5 times rated pressure (25_ W.G.) in straight lengths at room temperature independent of other conditions per UL-181 procedure. To ensure
Maximum Air Flow 5,500 FPM
Length 19.000000
Jacket Material Black Polyethylene Vapor Barrier
Insulated Yes
Inside Diameter 4"
Height 7.000000
Operating Temperature -20°F to 250°F (-28.8°C to 121.1°C)
Package Weight 5.000000
Width 8.000000
Warranty Offered Yes
Vapor Transmission Jacket only .1 (max .3) perms per ASTMC 96A
UPC 687410308003
UL Recognized Yes
UL Listed Yes
Size 4" x 25'
R-Value R4.2
Pressure Rating 10" positive, 3/4" W.G. negative per U.L. 181
Package Width 8.000000
Package Length 19.000000
Package Height 7.000000
EAN 0687410308003
Composition Steel, Fiberglass
Brand Quality Flex
Certifications UL181, SBCC, BOCA, NFPA90A and 90B, HUD515-1.1 (b)
Compliance UL 181, SBCC, NFPA 90A & 90B, HUD 515-2.1, BOCA, ACCA, ADC, ETL
Fire Rating Maximum flame spread: 25; Maximum smoke developed: 50
Core Material Exclusive Patented inner core
Dimensional Weight 7.000000
Cubic Measurement 0.615700