"I bought this in brown in the hope it would contrast less than white against red brickwork and mahogany effect PVCu window frames. It was spot on! Looks like it 'should' be there and doesn't stand out.
Just as a note, this has claws for rectangular flat channel as well as round pipe, so it is versatile."
"I wish I had known that it can be modified by breaking off tabs to use rectangular ducting, I had bought and installed an adaptor and a length of round ducting. The outlet only locates on the ducting using some tabs rather than a proper flange so there is a need for silicon sealant to ensure all the exhaust air goes where it should do."