Metu: METU stamped PF circular flanges for the connection of small diameter air-ducts.

PF Circular Flanges

Cost effective circular flange for small duct diameters (80 up to 180 mm)
In stainless steel upon request.
Assembly through SS Joining Clips.

Illustration of the METU PF circular flange

Duct wall
PF flange
The ends are tapered to facilitate the insertion of the flange
SS joining clip

Suitable Ducts

For inner-duct diameters from 80 up to 180 mm.
In-between diameters are not available.

Suitable duct types: spirally wound ducts, longitudinal seam ducts. Not always suitable for fittings (please refer to the instructions for more information)

Not suitable for round ducts with a parallel flange

Not suitable for elbows with parallel flanges

Not suitable for ducts with stiffening ribs

Not suitable for ducts and fittings with turned-out edges and ducts with stiffening ribs.

Fixation Methods

Fastening in the duct through blind-rivets and swaging.

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.

Spot welding only possible when the flange and duct are an exact fit (low tolerances).

Characteristics

The application of a sealant between the flange and the duct is necessary in order to make the connection air-tight.

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.

Gap between the ends of the round flange

No gap, as the flange is a pressed continuous ring.

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

Caution

A sealant must be applied.

In-between diameters are not possible

Cracks can appear on the stainless steel versions. They are unavoidable and consequently no reason for a claim.

Flanges PF