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

MFR: 04-GF*
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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


NameQuality Flex 04-GF* - Systems, Inc. - Black Insulated Flex R4.2 Bag, 04" X 25'
BrandQuality Flex
Gemaire Item Number04INBLKBG
Manufacturer Product Number04-GF*
SKU - PIM Number1365692186471
ERP Number136696
Unit of MeasureEA
Weight18.0 Pounds (Lb)
Length300.0 Inches (In)
Width4.0 Inches (In)
Height4.0 Inches (In)
Hazardous MaterialNo
EPA Cert RequiredNo
Country of OriginUSA
Jacket MaterialBlack Polyethylene Vapor Barrier
Vapor TransmissionJacket only .1 (max .3) perms per ASTMC 96A
CompositionSteel & Fiberglass
Core MaterialExclusive Patented inner core
Fire RatingU.L.181 (Flame Spread less than 25, smoke less than 50)
Inside Diameter4"
Maximum Air Flow5,500 FPM
Maximum PressureRated 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 a margin of safety, Gray Flex recommends pressure not greater than 3_ water gauge positive when operating conditions of maximum velocity and temperature above 160 degrees may exist simultaneously.
Maximum Temperature-20°F to 250°F (-28.8°C to 121.1°C)
Operating Temperature-20°F to 250°F (-28.8°C to 121.1°C)
Pressure Rating10" positive, 3/4" W.G. negative per U.L. 181
Size4" x 25'
Warranty OfferedGray Flex warrants for a period of five years from the date of purchase that all flexible ducts will be free from defects in material and workmanship, only if the ducts are installed in accordance with GrayÕs installation instructions and under conditions
ComplianceMeets requirements of U.L.181, SBCC, NFPA 90A & 90B, HUD 515-2.1, BOCA, ACCA, ADC, ETL
UL ListedYes
GEM - Case Quantity


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