Atco #031 Series 13102404 Insulated Flexible Duct, 4" Duct Size, 300" Length, 8 R-Value, Plain End Connection, Round, Polyester/Steel (Inner Core), Fiberglass (Insulation), Metallized Polyester/Fiberglass (Jacket), 6 In. Wc. (Positive), 1 In. Wc. (Negative) Pressure Rating

Color	:	Silver
Connection Type	:	Plain End
Diameter	:	4 "
Domestic/Import	:	Domestic
Duct Size	:	4 "
Finish	:	Reinforced Metallized Polyester
Flow Rate	:	5,000 FPM
Length	:	300 "
Material	:	Polyester/Steel (Inner Core), Fiberglass (Insulation), Metallized Polyester/Fiberglass (Jacket)
Pressure Rating	:	6 in. wc. (Positive), 1 in. wc. (Negative)
R-Value	:	8
Series	:	#031 Series
Size	:	4" 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, 4" Duct Size, 300" Length, 8 R-Value, Plain End Connection, Round, Polyester/Steel (Inner Core), Fiberglass (Insulation), Metallized Polyester/Fiberglass (Jacket), 6 In. Wc. (Positive), 1 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

UL 181 Class 1 certified for safety and code compliance.Features an air-tight inner core made of double-laminated polyester to prevent fiberglass erosion.Encapsulated steel wire helix prevents unraveling when cut for easier installation.Wrapped in a thick R-8 fiberglass insulation blanket for superior thermal performance.Includes a tough, tear-resistant, reinforced metallized polyester outer jacket.Suitable for supply and return air use in low-to-medium pressure residential and commercial systems.GREENGUARD Certified for low chemical emissions.