Atco #031 Series 13102520 Insulated Flexible Duct, 20" Duct Size, 300" Length, 8 R-Value, Plain End Connection, Round, Polyester/Steel (Inner Core), Fiberglass (Insulation), Metallized Polyester/Fiberglass (Jacket), 4 In. Wc. (Positive), 0.75 In. Wc. (Negative) Pressure Rating

Color	:	Silver
Connection Type	:	Plain End
Diameter	:	20 "
Domestic/Import	:	Domestic
Duct Size	:	20 "
Finish	:	Reinforced Metallized Polyester
Flow Rate	:	5,000 FPM
Length	:	300 "
Material	:	Polyester/Steel (Inner Core), Fiberglass (Insulation), Metallized Polyester/Fiberglass (Jacket)
Pressure Rating	:	4 in. wc. (Positive), 0.75 in. wc. (Negative)
R-Value	:	8
Series	:	#031 Series
Size	:	20" Diam x 25' L
Temperature Rating	:	-20-140 °F (Continuous, Max Pressure)
Vapor Transmission	:	0.05 perms
Velocity Rating	:	5,000 FPM
Vent Duct Shape	:	Round

Atco Insulated Flexible Duct, Model: #031 Series, 20" Duct Size, 300" Length, 8 R-Value, Plain End Connection, Round, Polyester/Steel (Inner Core), Fiberglass (Insulation), Metallized Polyester/Fiberglass (Jacket), 4 In. Wc. (Positive), 0.75 In. Wc. (Negative) Pressure Rating, -20-140 °F (Continuous, Max Pressure), 5,000 FPM, 0.05 Perms Vapor Transmission, Reinforced Metallized Polyester Finish, Silver, Domestic Origin

Features an air-tight, 2-ply polyester inner core designed for energy efficiency and to prevent fiberglass erosion.Encapsulated steel wire helix construction prevents unraveling when cut and allows for quick installation.Smooth inner core design minimizes friction loss and reduces operating costs.Insulated with a thick blanket of R-8 fiberglass for excellent thermal performance.Durable, tear-resistant outer jacket made of tri-directionally reinforced, metallized polyester.UL 181 Listed as a Class 1 Air Duct.Highly resistant to mold growth and certified for low chemical emissions (UL 2824, UL 2818).