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Jonny H Jonny H is offline
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Join Date: Jul 2013
Location: South East England
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Originally Posted by DaveMcKenz View Post
I have no doubt you are right. How does it work?
Essentially, when the valves are closed to the cabin, they are open to the ground and vice verse. So you always get air flow over the exhaust.

Edit. Oops, already answered several times above!

Last edited by Jonny H; 02-09-2018 at 01:35 PM..
Old 02-09-2018, 01:32 PM
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