Cooker hood roof vent - What do I need to put on the flat roof to vent out a cooker hood extractor fan?

I need to know what sort of cap ent I need I can’t seem to find one. the cooker hood will come stright up through a flat roof.
Hi
yes as I want to vent it out side to extract moisture from my kitchen.

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{ 4 comments… read them below or add one }

censored_4_tv March 29, 2010 at 8:35 am: I didn’t know it was necessary.
sparky March 29, 2010 at 8:49 am: i believe you extend the pipe up above the roof & the put a cap on
daffyduct2006 March 29, 2010 at 9:16 am: You could use flue pipe for a furnace/ water heater. You’ll need the pipe, roof flashing, storm collar, and cap. You may also need a square to round adapter at the fan’s connection.
KTB March 29, 2010 at 9:19 am: Simple, and this comes from an experienced roofer.

Extend the collar on the unit to just past your roof line. Thus it catches the wind. Place a quartered, or square cap on the end of the unit (assuring as even flow as you can) and enjoy the result(s).