Atco #031 Series 13102418 Insulated Flexible Duct, 18" 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	:	18 "
Domestic/Import	:	Domestic
Duct Size	:	18 "
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	:	18" 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, 18" 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

Air-tight inner core ensures energy efficiency and prevents fiberglass erosion into the air stream.Encapsulated steel wire helix prevents unraveling when cut, simplifying installation.Features R-8.0 fiberglass insulation for superior thermal performance.Tough, tri-directionally reinforced metallized polyester jacket resists tears and punctures.UL 181 listed as a Class 1 Air Duct for code compliance.Smooth inner core design minimizes friction loss and reduces operating costs.Formaldehyde-free insulation and certified for low chemical emissions (UL 2818).