Thermaflex 53807000001 - KM Silver Flex-Vent Insulated Flexible Air Duct, R6, 7" X 25' Box
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Flex-Vent KM is a thermally insulated, fully lined, UL 181 Class 1 flexible air duct designed for low to medium pressure cooling and heating HVAC systems. It can be used in either supply or return sections and provides economical means for handling misalignment between systems components and ducting around obstacles where fabricated and fitted ducts are difficult and costly to use. It is equally suitable for new jobs or retrofit work and is especially useful when making system extensions or for changing conditioned zones, now or in the future.

Compliance to NFPA Standards allows you to install lengths longer than the 14' limitation applying to connectors. It is a highly efficient part of the total duct system because the smooth liner, the ample insulation and tough outer vapor barrier provide good airflow, thermal insulation and a double air seal.
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Name Thermaflex 53807000001 - KM Silver Flex-Vent Insulated Flexible Air Duct, R6, 7" X 25' Box
Brand Thermaflex
Item Number FD07R625BX
Manufacturer Product Number 053807000001
SKU - PIM Number 1418232729575
ERP Number 344781
UPC 677431002028
Unit of Measure EACH
Weight 10.9 Pound (lb.)
Length 14.1 Inches (in)
Width 5.0 Inches (in)
Height 11.4 Inches (in)
Hazardous Material No
EPA Cert Required No
Country of Origin USA
R-Value R6
Jacket Material Vapor Barrior
Vapor Transmission 0.1
Certifications Yes NFPA 90 A and 90 B
Color Brown
Composition Strong Polyester film laminated and encapsulating a heavy corrosion resistant steel wire helix, forms the inner core and supports a thick blanket of fiberglass insulation over a fiberglass scrim. The outer vapor barrier is a bidirectional reinforced metal
Core Material Corrosion Resistant Steel Wire Helix
Fire Rating Meets UL 181 & NFPA 90A-90B Fire Codes
Inside Diameter 7"
Insulated Yes
Maximum Air Flow 5000 FPM
Maximum Pressure Positive 4''-16'' - 10wg, 18''-20'' - 6''wg Negative 4''-12'' -1wg 15''-20'' - 1/2 wg
Maximum Temperature Maximum = +250
Operating Temperature -20°F to 250°F (-28.8°C to 121.1°C)
Pressure Rating WG - Positive 10 inches (4"-16" ID), 6 inches (18"-20" ID) - Negative: 1/2 inch (4"-20" ID)
Warranty Offered 5 Year
Compliance NFPA 90 A and 90 B
UL Listed Yes
UL Recognized Yes
Size 7" x 25'
Tier KM Flexible Duct
GEM - Case Quantity

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