Adding remote fan for cooker hood

[Jason1790]

I am about to install a new cooker hood which has to be vented through the airing cupboard above, into the loft and out via a roof vent. I would like to add a remote fan in the loft space operated by the fan switch on the hood, ideally.

Can I run a cable directly from the switched live of the fan control on the hood to the remote fan or would I need an additional FCU for the remote fan installed in the loft to provide an obvious means of isolating the fan? Are there any regulations that may apply that I am missing?

The hood will be connected to a switched DP FCU spurred from the ring final with a 3a fuse fitted.

Thanks

Jason

 

[ban-all-sheds]

I am about to install a new cooker hood which has to be vented through the airing cupboard above, into the loft and out via a roof vent.

What are your plans for preventing condensation forming in the duct and running down into the hood?

I would like to add a remote fan in the loft space

Why?

PS EDIT:

Just thought - you aren't planning to have the cooker hood vent into the loft space are you? I originally thought you were planning to have the duct run through it to the roof vent, but I'm wondering now if that's why you want a fan in the loft.

If so - abandon that idea forthwith, or you'll get condensation up there and the roof will rot. A fan in the space will do nothing to prevent that.

 

[Jason1790]

Thanks for the reply b-a-s.

I should have said extractor fan, sorry.

The ducting will exit the roof via a tile vent. The extractor fan in the loft will be connected into the ducting. There is a weep socket for condensation and the ducting in the loft is insulated.

Bearing that in mind, do you think the extra FCU is ott?

 

[JohnW2]

Bearing that in mind, do you think the extra FCU is ott?

If, as I think you are saying, the fan will get it's power from somewhere (the hood) which is already fed by an FCU, nothing is to be gained by having a second one.

Kind Regards, John

 

[ban-all-sheds]

The extractor fan in the loft will be connected into the ducting.

But what's it for?

 

[Jason1790]

Thanks John,
That's what I was thinking but I was unsure about it (the extractor fan) being isolated in the kitchen.

 

[Jason1790]

The extractor fan in the loft will be connected into the ducting.

But what's it for?

To replace the fan on my cooker hood with a more powerful unit fitted in the loft but still operated using the controls on the hood.

You'll have to ask my wife why we didn't get a more powerful hood.

 

[JohnW2]

Thanks John, That's what I was thinking but I was unsure about it (the extractor fan) being isolated in the kitchen.

I don't personally see that as a problem. However, if you wanted, you could have an 'isolator' for the fan in the loft, but that could just be a DP switch - a second fuse would, as I said, serve no useful purpose.

Kind Regards, John

 

[ban-all-sheds]

To replace the fan on my cooker hood with a more powerful unit fitted in the loft but still operated using the controls on the hood.

OK.