The 90 mm diameter combination adaptor allows a portion of circular ductwork to be connected to a portion of oval ductwork, changing or keeping the same direction.

The combination fitting is connected to :

• The circular duct, which is male: An O-ring must be placed in the groove between the second and third ring of the duct to ensure that the system is watertight.
• The oval duct or another oval accessory with a sealing connector: Fixing can be secured with a collar or flange.

• Model: straight female adaptor
• For PE-HD Ø 90 mm oval ventilation duct and FRAENKISCHE PROFI-AIR Tunnel 132×52 ventilation duct
• Colour: white