Bathroom Extractor Fan - Duct Sizing Problem

This is only a guess Steve as I've never needed to try it but how about the plastic sleeve that's used to join 2 sections of 100mm drainage pipes together?
Welcome to the forum btw.

 

I would recommend that you get yourself a pack of 100 mm dia. insulated flexible ducting that should allow you to insert the 100 mm spigot on the fan in to the 165 mm duct, using the extra width of the insulation to pack the space around the spigot inside the duct. Denmans do a 10m pack for around £40 incl VAT. Cut lengths of it, say 300 mm, and push them over the fan spigot and then slide it in to the duct.

 

Hi Steve,
Don't know if you still need a solution for this job, but is this what you're after, to join the fan spigot and small end of the reducer together?
http://www.screwfix.com/p/manrose-round-connector-white-100mm/12697

 

Quote for 6" fans instead. They are available.

Your reducer sounds like it is designed to fit INSIDE the duct. Get some rigid 4" duct, cut a few inches off, use to join new fan to reducer.

Reducers are going to push your fan forward though?

 

Yes, Lec, I was wondering whether to suggest the same. 150mm fan would be better. More powerful too.

 

Steve
Please don't assume im taking the p*ss here, but i have used empty plastic plant pots to go between sizes of ducting in lofts etc!
Generally these can easily be trimmed down to size with a hacksaw blade or stanley knife and slipped over each end of the fan/vent/reducer and then with the application of a few wraps of duct tape there as good as permanant!
There conical and in every size you will ever need and made of plastic so wont go rusty.

Regards
**
Most garden centres have thousands in the scrap skip that they will give you for nothing. Keep a few in your van for a cheap but effective fix!

 

Yee..haar

 

Allybally
Im assumming that you think im a cowboy with my cheap and effective fix!
It's cheap and it works as you can trim the plastic flower pots to any size you like and so fit it to any manufactured fan or ducting - it's coming up with a practical solution and not being a gunslinger you Muppet!

 

ive used rubber drainage coulpers before cos the come in diferent sizes and have some give in them, and have large jubilee clips on em.

 

I'm thinking your a cowboy to avoid purchasing a £2 adaptor, but to take the time and effort to make an adjustable device that is made from a plant pot, just not worth it, look I understand this site is for advice and help for areas that were not up to scratch on But using plant pots, next you'll be telling me it's ok to use them on down lights to make them fire rated! Plant pots are for plants

 

@Allybally can you post a link to or advise where them £2 adaptor(s) can be purchased

 

For a decent job you'd use a decent 6" fan.

The Manrose 4" are cheap and don't work very well and wear out quickly.

You should have pointed out to the hotel owner that increased years of service, less money calling out an electrician to fix faults, and savings in redecoration due to condensation and mould build up make the initally more expensive fan cheaper in the long run.

Also there may have been a reason for the larger fan: Do the existing fans share common ducting? A 4" fan will only push air for 3m. A larger more powerful fanmay have been needed for longer ducting runs.

 

Well I support the lateral thinking of using plant pots. Excellent idea. We are providing a means of channelling air. Have you never used flexible white thin flimsy horrible ***** ducts sold for peanuts with all the cheap fans on the market? That stuff rips as soon as you look at it. Well done Mr Jenks for using some gumption. Ally bally your out of order.

 

I'm not out of order, if there's a product on the markt for the job use it, you don't need to make shift things especially in a hotel, I work for alot of big hotels and schools and this sort of job is not necessary, the job needs doing so doing properly the once, not bodge it!

Ally

 

A little bit cheaper than quoted https://www.tlc-direct.co.uk/Products/FD414C.html

Ally