Thermaflex - 56512000001 - 12" x 25' RKD R4.2 Flex-Vent Insulated Flexible Air Duct

Item: THFRKD1225
MFG: 56512000001
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12" RKD R4.2 Flex-Vent Insulated Flexible Air Duct


Thermaflex R-KD Insulated For Outdoor Heating and Cooling In Low/Medium Pressure Systems. Ideal For Add-On Mobile Home Remote Air Conditioning and For Connecting Doublewide Units. Also Popular In Modular Building Systems. Perfect For Handling Misalignment Between System Components. For Example, It Can Be Easily Redirected Around Obstacles, Unlike Costly Stainless Steel Ducts.

Flex-Vent Advantages:
  • Fast, Economical Installation.
  • Oversized Cores For Proper Fit.
  • Easily Shaped To Fit Oval Inlets.
  • Superior Insulation and Thermal Performance.
  • UL181 Listed and Complies with NFPA Standards 90A and 90B.
  • Complies with Most State and Federal Standards or Codes.
  • Ideal For Residential Air Distribution and Venting Applications.
  • Flex-Vent Is Competitively Priced and Backed By A 5 Year Warranty.
  • Diameter: 8-14 Inches ID
  • Pressure Rating: (Wg)
  • Positive: 6 Inches (8"-14" ID)
  • Negative: 1/2 Inch (8"-14" ID)
  • Velocity: 5000 Fpm
  • Temp.Range:-20F To 250F
  • R-Value: R-4.2, R-8.0
  • 5 Year Warranty
Meets Ul 181. Complies With Hud Mobile Home Construction Safety Code Part 3280.715

California residents: see Proposition 65 Warning

Features and Specification

Dimensional Weight 41.0000
Insulated Yes
Inside Diameter 12"
Height 15.1250
Fire Rating Meets UL 181 & NFPA 90A-90B Fire Codes
EAN 0677431004367
Cubic Measurement 1.5887
Brand Thermaflex
Application Air Distribution
Core Material Polyester Film
Certifications GreenGuard
Comments/Notes UL Listed - USA & CAN
Compliance NFPA 90 A and 90 B
Composition Laminated Polyester duct liner is permanently bonded to a corrosion-resistan spring steel wire helix. Also supporting a thick blanket of fiberglass insulation and fiberglass scrim vapor barrier is an outer jacket of heavy Black polyethylene.
Length 15.1250
Width 12.0000
Size 12" x 25'
Tier R-KD
R-Value R4.2
UL Listed Yes
UL Recognized Yes
UPC 677431004367
Warranty Offered Yes
Maximum Air Flow 5000 FPM
Maximum Temperature 250°F (121.1°C)
Operating Temperature -20°F to 250°F (-28.8°C to 121.1°C)
Package Height 15.1250
Package Length 15.1250
Package Weight 17.3000
Package Width 24.8750
Pressure Rating WG - Positive 6 inches (18"-20" ID) - Negative 1/2 inch (6"-12" ID)
Maximum Pressure Positive = 6" (6-14" ID) Negative = 1" (6-12" ID) 1/2" (14" ID)
Weight 17.3000


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