Why not stocked.

Why don't SF stock 350mm x150mm round duct, you have 100mm & 125mm (15872/54391) listed.
Neither do you stock 150mm flap vents, but again you have 100mm & 125mm sizes listed.
Was going to get a 150mm fan for kitchen today, have had to go elsewhere, where they also have the 150mm round duct, flap vent & fan.

And I ain't buying a fixing kit when I only need the pipe & fan.

 

Thanks, no good.

I need 150mm diameter x 350mm length rigid duct pipe to go through a wall.

A lot of cooker extractor hoods, use 150mm ducting nowadays, as does my Bosch hood & also wall extractor fans, like the one in my kitchen here.
I wouldn't fit any ducting less than 150mm in a kitchen today.