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Thermaflex 53805000001 - KM Silver Flex-Vent Insulated Flexible Air Duct, R6, 5" X 25' Box

Item: FD05R625BX
MFR: 053805000001
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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.


NameThermaflex 53805000001 - KM Silver Flex-Vent Insulated Flexible Air Duct, R6, 5" X 25' Box
Gemaire Item NumberFD05R625BX
Manufacturer Product Number053805000001
SKU - PIM Number1418232729569
ERP Number344780
Unit of MeasureEACH
Weight8.4 Pound (lb.)
Length11.4 Inches (in)
Width6.0 Inches (in)
Height11.4 Inches (in)
Hazardous MaterialNo
EPA Cert RequiredNo
Country of OriginUSA
TierKM Flexible Duct
Jacket MaterialVapor Barrior
Vapor Transmission0.1
CertificationsYes NFPA 90 A and 90 B
CompositionStrong 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 MaterialCorrosion Resistant Steel Wire Helix
Fire RatingMeets UL 181 & NFPA 90A-90B Fire Codes
Inside Diameter5"
Maximum Air Flow5000 FPM
Maximum PressurePositive 4''-16'' - 10wg, 18''-20'' - 6''wg Negative 4''-12'' -1wg 15''-20'' - 1/2 wg
Maximum TemperatureMaximum = +250
Operating Temperature-20°F to 250°F (-28.8°C to 121.1°C)
Pressure RatingWG - Positive 10 inches (4"-16" ID), 6 inches (18"-20" ID) - Negative: 1/2 inch (4"-20" ID)
Size5" x 25'
Warranty Offered5 Year
ComplianceNFPA 90 A and 90 B
UL ListedYes
UL RecognizedYes
GEM - Case Quantity