Cost effective circular flange for small duct diameters (80 up to 200 mm)
Pressed flange which can be swaged into the duct. That way the duct inner surface remains free of any projections (for dust removal, wood chips transport and other similar applications requiring a smooth inner duct surface).
Alternative fastening methods: spot welding, self-tapping screws or blind rivets
Assembly through SS Joining Clips.
Screws are less recommended, as they protrude inside the duct, hindering the air-flow and the cleaning operations, and could be the cause of leakages.
The flanges stiffen the ducts and help maintaining their round shape. They also improve the resistance of the ducts under negative pressures. Ducts should nevertheless be strong enough by themselves and resist the required pressures (+ or -) without taking the flanges into account.
Available in galvanized steel and stainless steel V2A (1.4301 ASTM 304) upon request. Cracks can appear on the stainless steel versions. They are unavoidable and consequently no reason for a claim. Please also refer to ZI-101