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Electrical

Fitting An Internal Extractor Fan Retrospectively

Anonymous user 28/02/2024 - 3.50 PM

Hi there, We recently had some work done to our flat, including creating a utility room in a cupboard. Unfortunately, on applying for a completion certificate, we have realised that there is no extractor fan or trickle ventilation (a fresh air inlet duct) as outlined on our plans within the internal room. In order to get the certificate, we need to have these things added retrospectively but as the room is internal and because we are on the 2nd floor, we don't know how this is possible - do we need to duct along the ceiling of a joining room to an outside wall?

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4 Answers

Arc Electrical

Rating: 5 out of 5
Wigton
Difficult to comment too much without seeing the actual job, but sounds like a possibility, you could use flat ducting which is white hard plastic ducting, approximately 4"x 2" in Screwfix catalogue. Electrician would be needed to retrofit wiring for fan and you would also need a local fan isolation switch
Answered10 June 2020
10

A.N.T Electrical

Rating: 5 out of 5
St Albans
Yes you would need a route with a 100mm/ 4” duct out to the exterior of the building. Also the fan would need a 230v supply preferably from the New utility room switch. This can be achieved in many ways but would need assessing to see exactly what is necessary.
Answered10 June 2020
0

home240 electricals

Rating: 5 out of 5
Colchester
to add some more information - ventilation is covered by Part F of the building regulations and is quoted for a utility room as 30ltrs per second of intermittent air extraction required (ie timed extractor fan) which would require a 6" fan - not found a 4" fan that will do this it also quotes continuous air extraction (instead of intermittent so running all time ) of 8ltr per second - a 4" fan left on permanently will do this - most are between 11 and 16ltrs per second
Answered20 June 2020
0

Anonymous user

I agree with all other answers but would just like to add that if there is no available void to run the ducting in then unfortunately this would need to be run surface mounted to the ceiling & run through the adjacent rooms. It could be boxed in or have a false ceiling fitted afterwards, to conceal the ducting, however this would be quite costly.
Answered1 July 2020
0