Same profile shape as the AF circular flange, but without the sealing lip.
Contrary to the AF, BF and LF flanges, a sealant must be applied.
Fastening with self-tapping screws or blind rivets.
Assembly using SR Joining Clips.
For duct-Ø 200 up to 3000 mm.
Suitable duct types: spirally wound ducts, longitudinal seam ducts, fittings, ducts with stiffening ribs.
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 should not be used.
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.
Any gap, created when the flange is fixed into the duct, is bridged by an integrated connecting part. The stability of the flange is that way maintained.