air extracter problem

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.

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.

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.