Chimney hood external ducting

diywhynot

southcoastrgi wrote: »

oh dear i am so sorry to laugh at your post :rotfl:

No problem .. I've had a good laugh at many of yours.:D

diywhynot

cyclonebri1 wrote: »

:rotfl:
If you follow eastenders series of posts it seems the builder can't speak a word of English, I know, I know, but it's true.:rotfl::rotfl:

Nah...life is too short and the weather too nice to waste...this is just as boring as the soap of the same name.:D

southcoastrgi

diywhynot wrote: »

Nah...life is too short and the weather too nice to waste...this is just as boring as the soap of the same name.:D

So why are you even here ? & as you are a newbi & I've had a name change I doubt that you have read any of my posts, but if you have I'm glad I brightened your day, btw I was just laughing at your comment & if you had done what cyclonebri1 was saying you would know why we were both laughing.

diywhynot

southcoastrgi wrote: »

So why are you even here ? & as you are a newbi & I've had a name change I doubt that you have read any of my posts, but if you have I'm glad I brightened your day, btw I was just laughing at your comment & if you had done what cyclonebri1 was saying you would know why we were both laughing.

I suspect lots of folks read the forums but don't post, perhaps put off by the aggressive tenor demonstrated by a, fortunately, small minority.....shame that as I've read excellent advice both here and on other MSE forums. Let's just say I'm not surprised by your comments.;)

southcoastrgi

i hate to disapoint

ListysDad

Back to the original Q.

Any form of flexi ducting will introduce resistance to air flow and make the system less effective. So, as you are sensitive SOLID duct work is your only option. For your terminal go for a BIGGER size and adapt it up.

For the turn from vertical to horizontal on top of the cupboards use a swept bend NOT an elbow or round to flat converter. Using an elbow will a) make the system more noisy than it should be and b) reduce efficiency. Using a converter will shorten the life of the fan, reduce air flow by as much as 50% and sound like a jet engine taking off.

You will hear the air flow but its easy to quieten down by boxing in the top above the cupboards and wrapping the duct in rockwool.