4" x 25' Silver Insulated Air Duct

This is a silver-colored air duct that is designed to be strong and durable. It has a metallic outer layer reinforced with fiberglass and a two-layer black polyester inner core. This design makes it more resistant and long-lasting. The air duct can operate in temperatures ranging from -20 to 140 degrees Fahrenheit when the pressure is at 6 inches of water, and from -20 to 180 degrees Fahrenheit when the pressure is at 2 inches of water. The maximum flame spread is 25 and the maximum smoke development is 50, meaning it has a low risk of spreading flames and producing smoke. This air duct is UL listed.

• Designed for wherever UL-181 standards for Class 1 air duct is required
• The 2-ply polyester laminated inner core provides outstanding resistance and durability
• The fiberglass reinforced metalized outer jacket is extremely strong and will not unravel
• Operating pressure 10 in H2O (2.5 kPa) intermittent positive, 6 in H2O (1.5 kPa) continuous positive and 2 in H2O (0.5 kPa) negative. Operating temperature range of 6 in H2O (1.5 kPa) positive is -20 to 140 deg F, 2 in H2O (0.5 kPa) positive of -20 to 180 deg F and 1/2 in H2O (0.13 kPa) positive 250 def F max
• Perfect for use with heating, ventilation and air conditioning systems