Underground Ventilation Duct - 11 13/16" (Diameter) x 32 ft (Length) - Spiral The 11 13/16” in diameter spiral tunnel and mining duct has a length of 32 feet and is made out of a biaxial polyester. It is able to endure temperatures between -4°F and +176°F and positive pressure between 6000 and 8000pa. Function The spiral tunnel and mining duct allows air to travel through helix steel-coiled ducting, circulating fresh air or removing unwanted air. One end of the duct can be attached via strap to a ventilator, and the ducts can be attached to one another, inter-connecting them, using the same strapping method. Applications The spiral tunnel and mining duct may be used for a ventilation system in any extreme underground construction, especially when mines and tunnels need ventilation, and in any environment where positive or negative pressure is required. It can be used in conjunction with ventilation fans.

Underground Ventilation Duct - 11 13/16" (Diameter) x 16 ft (Length) - Spiral The 11 13/16” in diameter spiral tunnel and mining duct has a length of 16 feet and is made out of a biaxial polyester. It is able to endure temperatures between -4°F and +176°F and positive pressure between 6000 and 8000pa. Function The spiral tunnel and mining duct allows air to travel through helix steel-coiled ducting, circulating fresh air or removing unwanted air. One end of the duct can be attached via strap to a ventilator, and the ducts can be attached to one another, inter-connecting them, using the same strapping method. Applications The spiral tunnel and mining duct may be used for a ventilation system in any extreme underground construction, especially when mines and tunnels need ventilation, and in any environment where positive or negative pressure is required. It can be used in conjunction with ventilation fans.

Underground Ventilation Duct - 10" (Diameter) x 32 ft (Length) - Spiral The 10” in diameter spiral tunnel and mining duct has a length of 16 feet and is made out of a biaxial polyester. It is able to endure temperatures between -4°F and +176°F and positive pressure between 6000 and 8000pa. Function The spiral tunnel and mining duct allows air to travel through helix steel-coiled ducting, circulating fresh air or removing unwanted air. One end of the duct can be attached via strap to a ventilator, and the ducts can be attached to one another, inter-connecting them, using the same strapping method. Applications The spiral tunnel and mining duct may be used for a ventilation system in any extreme underground construction, especially when mines and tunnels need ventilation, and in any environment where positive or negative pressure is required. It can be used in conjunction with ventilation fans.

Underground Ventilation Duct - 13" (Diameter) x 16 ft (Length) - Spiral The 13” in diameter spiral tunnel and mining duct has a length of 16 feet and is made out of a biaxial polyester. It is able to endure temperatures between -4°F and +176°F and positive pressure between 6000 and 8000pa. Function The spiral tunnel and mining duct allows air to travel through helix steel-coiled ducting, circulating fresh air or removing unwanted air. One end of the duct can be attached via strap to a ventilator, and the ducts can be attached to one another, inter-connecting them, using the same strapping method. Applications The spiral tunnel and mining duct may be used for a ventilation system in any extreme underground construction, especially when mines and tunnels need ventilation, and in any environment where positive or negative pressure is required. It can be used in conjunction with ventilation fans.

Underground Ventilation Duct - 23 5/8" (Diameter) x 16 ft (Length) - Spiral The 23 5/8” in diameter spiral tunnel and mining duct has a length of 16 feet and is made out of a biaxial polyester. It is able to endure temperatures between -4°F and +176°F and positive pressure between 6000 and 8000pa. Function The spiral tunnel and mining duct allows air to travel through helix steel-coiled ducting, circulating fresh air or removing unwanted air. One end of the duct can be attached via strap to a ventilator, and the ducts can be attached to one another, inter-connecting them, using the same strapping method. Applications The spiral tunnel and mining duct may be used for a ventilation system in any extreme underground construction, especially when mines and tunnels need ventilation, and in any environment where positive or negative pressure is required. It can be used in conjunction with ventilation fans.

Underground Ventilation Duct - 23" (Diameter) x 32 ft (Length) - Spiral The 23” in diameter spiral tunnel and mining duct has a length of 32 feet and is made out of a biaxial polyester. It is able to endure temperatures between -4°F and +176°F and positive pressure between 6000 and 8000pa. Function The spiral tunnel and mining duct allows air to travel through helix steel-coiled ducting, circulating fresh air or removing unwanted air. One end of the duct can be attached via strap to a ventilator, and the ducts can be attached to one another, inter-connecting them, using the same strapping method. Applications The spiral tunnel and mining duct may be used for a ventilation system in any extreme underground construction, especially when mines and tunnels need ventilation, and in any environment where positive or negative pressure is required. It can be used in conjunction with ventilation fans.