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Topic Title: Extractor Fan Query.
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Created On: 21 April 2017 12:18 PM
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 21 April 2017 12:18 PM
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Zoomup

Posts: 2995
Joined: 20 February 2014

How high above a gas hob should a 4 inch plastic extractor fan be mounted to prevent damage to it please?

Z.
 21 April 2017 12:55 PM
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NMBelectrical

Posts: 50
Joined: 28 February 2017

Hi, off the top off my head I'm pretty sure its 750mm from the top of the hob/cooker. If we put them above a hob we normally put them so the top of the fan is level with the top of the wall units. Which should be 1200mm from the worktop.

Nick
 21 April 2017 02:10 PM
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geoffsd

Posts: 1523
Joined: 15 June 2010

Do you mean just an ordinary extractor fan; not a cooker hood?

If so, I would think near the ceiling would be better.
 21 April 2017 03:07 PM
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Zoomup

Posts: 2995
Joined: 20 February 2014

Originally posted by: geoffsd

Do you mean just an ordinary extractor fan; not a cooker hood?



If so, I would think near the ceiling would be better.


Yep, a normal plastic 4 inch extractor fan. There is no room at the ceiling position. Units in the way. A hole has been made by the builder just above the gas hob.

Z.
 21 April 2017 09:53 PM
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mapj1

Posts: 8957
Joined: 22 July 2004

That will depend on the power rating of the gas hob, and the type of plastic. The figure of 750mm is typical in the makers instructions for the bottom of the funnel edge of a hood designed to go above a cooker, sometimes a tad lower over electric cookers, but that is a hood which is mostly metal with exposed high temperature plastics, and the fan motor some way inside.
Kitchen fan extractors are normally offset or in a vertical wall, or ducted.
I'd suggest for an all plastic fan, aiming rather higher than the minimum for a hood, as the maximum temperature can be very low
this set of fan instructions for example say
The fan should not be sited where it would be subject to a direct source of heat in excess of 40ºC.
When installing wall mounted fans,ensure that there are no buried cables or pipes in the way. It is recommended that this fan is mounted 1.8m above floor level.

also 4 inch feels perhaps a bit mean for a kitchen, especially if folk fry a lot - we have an 8" ducted fan here chez mapj1. Mind you it can suck the door shut..

-------------------------
regards Mike
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