Materials: Galvanized Steel Sheet, Stianless Steel Sheet
Size: Φ4" ~ Φ60"
Features:
Spiral seam adopts double seam butt joint, between the two seams, having three strengthening reinforcement grooves which more strengten the strengten of spiral duct.
Utilizing high speed automatic cutting equipment, no bur, pioe diameter accurately conform to the standard of SMACNA.
Size: Φ4" ~ Φ60"
Features:
Spiral seam adopts double seam butt joint, between the two seams, having three strengthening reinforcement grooves which more strengten the strengten of spiral duct.
Utilizing high speed automatic cutting equipment, no bur, pioe diameter accurately conform to the standard of SMACNA.
The standard length is 3m.
Having the certification of ISO9001:2008
Having the certification of ISO9001:2008