This is a rear mounting duct that fits onto the back of a 340 x 340 Corrugated Colorbond Vent.

This particular rear mount will suit a 125mm diameter duct to fit onto it, or a 125mm diameter fan.

It has a pressed rectangular dish that simply fits inside the corrugated colorbond vent and you screw everything together from front face.

You need to cut a rectangular hole in the colorbond sheeting to accept the rear duct mount,

Either 270 wide x 300mm high rectangular hole for vertically orientated vents

Or 300mm wide x 270mm high rectangular holes for horizonatlly orientated vents.

Please note this product is for the rear duct mount only.

You will still need to select a 340 x 340 Corrugated Colorbond Vent to go with this rear duct mount.

This 125mm diameter rear duct mount will only fit a 340 x 340 Corrugated Colorbond Vent in either Horizontal or Vertical.

We also make other sizes upon request.