plain flange&air duct flange&air condition flange mainly export to middle east and africa and south america etc

air-duct flange:

Plane flanges permit ducts to be joined with extremely low leakage.

The panels are joined in their width sections through the "H"-type

bayonet structure without using any gaskets. Generally they are made
of PVC in 4 meter lengths. Ideal for the creation of take-offs and

tap-ins and connection into the plenum chamber.

Also available  are "U"type, "F"type, "H"type, and "Y"type aluminum flanges.