Round Connections

Round Duct Connections

A quick and uncomplicated installation of circular ventilation ducts on site is an undeniable economic and practical advantage.

Minimum air-tightness classes C (DIN EN 12237) and ATC3 (DIN EN 16798-3).

Unless indicated otherwise, the diameters always correspond to the inner diameters of the ducts.

What differentiates the AF, LF, BF and UF flanges is the way they are fixed into the circular ducts. They can still be combined with each other (connecting an AF flange with an LF flange for example) as they have all been designed to be assembled together with SR joining clips.

In most cases your first choices would be the MU Overcollars and the AF Circular Flanges.

Round Flanges AF
Most popular flange
Ø 200 to 3000 mm
Air-tightness class C (DIN EN 12237)
Air-tightness class ATC3 (DIN EN 16798-3)
Assembly with SR joininig clips

 

Round Flanges LF
For ducts with tured-out edges (Vanstone)
Ø 200 to 3000 mm
Air-tightness class C (DIN EN 12237)
Air-tightness class ATC3 (DIN EN 16798-3)
Assembly with SR Joininig Cips

 

Round Flanges BF
These flanges enter deeper into the ducts, translating into more flexibility.
Ø 200 to 3000 mm
Air-tightness class C (DIN EN 12237)
Air-tightness class ATC3 (DIN EN 16798-3)
Assembly with SR Joininig Cips

Round Flanges UF
This UF flange requires more work than the others including the application of a sealant.
For duct-Ø from 200 to 3000 mm
Air-tightness class C (DIN EN 12237), ATC3 (DIN EN 16798-3)
Assembly with SR Joininig Cips

Joining Clips SR
Allow to assemble the AF, UF, LF and BF flanges together.
Must be ordered with gasket in order to achieve the air-tightness class C / ATC3

 

Overcollars MU
Economical connections
Duct-Ø from 71 to 315 mm
Air-tightness D (DIN EN 12237) or ATC2 (DIN EN 16798-3)

Pressed Circular Flanges PF
For duct diameters from 80 to 200 mm
Air-tightness class C (DIN EN 12237) or ATC 3 (DIN EN 16798-3)
Assembly with SS joining clips

Joining Clips SS
For the assembly of ducts fitted with PF flanges.
Must be ordered with gasket in order to achieve the air-tightness class C / ATC3

 

Assembly Help

MRF Measuring Bands
For the precise measurement of the inner duct diameters according to DIN EN 1506

 

NZ and PNZ Notching Tools
For the punching of accurate notches (Distance: approx. every 80 mm) for the fastening of AF and BF circular flanges into the ducts or fittings.

Nut Runners SE
For the tightening of SR Joining Clip nuts within seconds.

 

Lubricant for Stainless Steel Parts
Anti-seize paste for the assembly of nuts and bolts made of stainless steel

Circular Connections Overview

Round or Rectangular?
Here are some thoughts on the subject.

Why not use laser-welded ducts instead of spiral ducts as standard?

In view of the several flange types, the different materials and the numerous diameters, circular flanges are most of the time manufactured "just-in-time". A small stock is nevertheless often practical.