Ducting for Island Cooker Hood

Joined
28 Apr 2010
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Avon
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United Kingdom
I'm refitting my kitchen and have just fitted a 2m rectangular 125mm duct to provide a new island cooker hood with an external extraction route - however having now looked at some hoods, many seem to require 150mm ducting?

For such a short run, does this matter and can I simply use a reducer from 150mm to 125mm? The only angle in the duct route is where it turns 90 degrees downwards from the ceiling for the hood itself.
 
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Opinion on this matter seems to be divided, personally I can see no problem with using reducers as simple physics dictates that the only difference there can be is that the air flow speed rate is increased.
 
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Opinion on this matter seems to be divided, personally I can see no problem with using reducers as simple physics dictates that the only difference there can be is that the air flow speed rate is increased.

I totally agree - ok I'll press on :D Thanks for the help.
 

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