We have two extractors going to one flat roof vent. Both rooms lack there
own external wall hence the system. There is a wall extractor in a shower
room, then a T-junction with one-way valves between the shower vent and hob
extractor. The ventilation then goes to an inline extractor controlled by
the shower room vent.



There is little air coming out at the flat roof but a great deal of kitchen
extraction going into the shower room. There is no difference whether the
shower room vent is on or no, is over whelmed by the hob extractor. My
feeling is the electrician should have fitted the inline extractor between
the T-junction and the shower room not between the junction and roof vent.
Where it is could be restriction the airflow?



I have told them to come back to sort it out but would be grateful of ideas
of what they should be doing to sort it out.




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I have just taken the T junction to bits and there are no non return valves
fitted as I was told.




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Is there another way if these create problems?
We clearly can't use a system that takes the cooking air into the shower
room!
"Owain" wrote in message
...
John wrote:
I have just taken the T junction to bits and there are no non return
valves fitted as I was told.

I think that's the answer...

non-return valves probably not a great idea anyway, especially with greasy
kitchen extraction, as they are very liable to sticking.

Owain






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John (nospam) wrote:
Is there another way if these create problems?
We clearly can't use a system that takes the cooking air into the shower
room!
"Owain" wrote in message
...
John wrote:
I have just taken the T junction to bits and there are no non return
valves fitted as I was told.

I think that's the answer...

non-return valves probably not a great idea anyway, especially with greasy
kitchen extraction, as they are very liable to sticking.

Owain




I did a system to extract from 2 bathrooms where a single (powerful)
inline fan sat beyond the T and extracted from both using adjustable
vents to balance the flow. It's controlled by a couple of relays so
that it can be operated from either location, and works well. You could
use a fanless cooker hood in the kitchen (or just remove the fan from
the existing) and use the switches on the hood to control one of the
relays, with the other controlled by the bathroom light. No non return
valves needed. Obviously when either switch is on you get extraction
from both rooms, but as long as the system is fairly quiet, that's not
a problem. Can give you more details if you think it would help.

A

wrote in message
ups.com...

John (nospam) wrote:
Is there another way if these create problems?
We clearly can't use a system that takes the cooking air into the shower
room!
"Owain" wrote in message
...
John wrote:
I have just taken the T junction to bits and there are no non return
valves fitted as I was told.

I think that's the answer...

non-return valves probably not a great idea anyway, especially with
greasy
kitchen extraction, as they are very liable to sticking.

Owain




I did a system to extract from 2 bathrooms where a single (powerful)
inline fan sat beyond the T and extracted from both using adjustable
vents to balance the flow. It's controlled by a couple of relays so
that it can be operated from either location, and works well. You could
use a fanless cooker hood in the kitchen (or just remove the fan from
the existing) and use the switches on the hood to control one of the
relays, with the other controlled by the bathroom light. No non return
valves needed. Obviously when either switch is on you get extraction
from both rooms, but as long as the system is fairly quiet, that's not
a problem. Can give you more details if you think it would help.

A


Thanks will pass this on. The only problems are that the kitchen units are
wood and the extractor is a unit in a hood box (but could make up a light
and fan switch some how. The main one is I don't see my electrician changing
every thing as I have no intention of paying them but expect them more to
make what I have paid for work.




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On Sat, 28 Oct 2006 18:56:44 +0100, "John"
wrote:


I have just taken the T junction to bits and there are no non return valves
fitted as I was told.


the ' inline extractor controlled by the shower room vent' is clearly
in the wrong place. It would have to be switched on every time the
hood fan is used, but even then I doubt it has the flow capablility of
the hood fan.

You dont want anything impeding the flow from the hood and you should
use the diameter duct recomended or greater.