Spiral Ventilation Duct

S ulong Spiral Ventilation Duct is also called Negative flow duct, Flexible Ducting or Simi-rigid Duct. It is used for both positive and negative pressure application of underground tunnel and mining projects. It is produced based on positive flow ducting, it installs hard-drawn steel or spring steel as frame on the lay flat ducting to support it withstand high pressure. The diameter can be customized from 150 mm to 2,000 mm and length for every piece is 1 m to 20 m.

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PVC Fabric		SL-PFD-Ⅲ	SL-PFD-Ⅱ	SL-PFD-TⅢ	SL-PFD-TⅡ	SL-PFD-TⅠ
Threads & Yarn		500D×840D	1000D×1000D	1000D×1000D	1500D×1500D	2000D×2000D
		9×12	9×12	12×12	9×12	9×9
Total Weight		420±20	500±20	550±20	600±20	700±20
Color		Yellow / Black / Green
Tensile Strength (DIN53354)	Warp (N/5cm)	1000	1200	1600	1800	2600
	Weft (N/5cm)	1000	1500	1900	2000	2600
Tearing Strength (DIN53363)	Warp (N)	220	320	500	650	720
	Weft (N)	300	380	500	680	720
Working Temperature		-30℃ ~ +80℃
Flame Retardant		NFPA701:2015, DIN 4102 B2
Inside Diameter		150 mm - 2,000 mm
Length		1 m - 20 m
Standard Pitch		75 mm for exhausting, 150 mm for blowing
Wire		Hard-Drawn steel / Spring Steel
End Finish		Zipper / Steel Ring / Velcro
Conductivity		≤10⁸ Ω (both for Black and Yellow)
* We hereby state that the above data is only for reference, allowing 5% tolerance.

Working temperature: -30℃ ~ 80 ℃.
Diameter: 600 mm~3200 mm
Standard Length: 5 m~200 m
Standard color: Yellow, Black, Green
Connection: Zipper, End Coil, Eyelet, Velcro

S L is also called Negative flow duct, Flexible Ducting or Simi-rigid Duct. It is used for both positive and negative pressure application of underground tunnel and mining projects. It is produced based on positive flow ducting, it installs hard-drawn steel or spring steel as frame on the lay flat ducting to support it withstand high pressure.

The diameter can be customized from 150 mm to 2,000 mm and length for every piece is 1 m to 20 m. Kind of connection can be customized: Zipper, Steel Ring, Eyelet and Velcro.

Five different types of PVC coated fabric to meet different models of ventilation fans and the fabrics can be flame retardant and anti-static. Also other fabric specification can be customized according to clients' requirement.

Quality standard abides by GB/T 9900-2008, NFPA 701, MA and SGS.