Powering extractor fans

[Sigurd]

We are installing two extractor fans in a church hall which is used fro meetings, lectures, etc. Also occasionally for Lent lunches and coffee mornings. As you can guess, finance is an issue.

Is it safe and legal to power these from standard 13 amp sockets (which are fed from professionally installed RCD consumer units. Our intention is to plug the extractor fan into a count down type time which is in turn plugged into a 13 amp socket, so that at the end of a meeting or whatever, it can be switched on from the timer, and it will automatically switch off after a set time - usually 2 hours.

We haven't decided on a fan as yet but it needs a to be in the 9"/10"" size to fit the pane of glass.

Many thanks for any help offered.

 

[Sigurd]

Will certainly do so. My simple (I thought) question seems to have stimulated quite a discussion so I will make sure I bring it to a conclusion!

 

[Marvo]

Simple questions are rarely simple and discussion is a good thing, hopefully you've got enough info to prevent money being spent on something that's not going to fulfil the brief.

If you find your extract rates are a bit shy you can set a longer overrun time on the system if you use an occupancy sensor.

Good luck.

 

[johnduffell]

The volume of the hall is around 200 c.m.

555 litres per second would give around 10 air changes per hour

good point, slight calculation, I should have said 1800 would give nearly 40 ACH.

Thanks for the correction!