Bathroom Extractor Fan - Ducting Problem

[KingKenny]

Hi everyone - This is weird - not strictly an electrical question, as I'm comfortable with what I've been asked to do in that area...I've even tested the fan in this job works as expected and it does. Fine.

BUT...

I've been asked to install a number of bathroom extractor fans in an old hotel, but to use the existing ducting. Most modern extractor fans (Manrose, Expelair etc..) appear to have 100mm diameter spigots. BUT ... the existing duct pipes are 6 1/4 inch. I ordered a ducting reducer 150mm to 100mm, expecting the 100mm to fit snugly over the fan spigot, but of course it didn't - they are exactly the same size, hard plastic/PVC. There are some fans that have 99mm spigots, but again, I don't think there will be enough 'give' in the reducer for I to fit, so I'm reluctant to order one.

So, what do I do? I'm missing some basic knowledge here.

Any / All advice welcome

Thank You.

 

[telectrix]

why not fit 6" fans?

 

[Silly Sausage]

https://www.google.co.uk/search?client=opera&q=100mm+pvc+coupling&sourceid=opera&ie=UTF-8&oe=UTF-8

and a can of pipe cement!

 

[KingKenny]

why not fit 6" fans?

Client wants to cut down cost. Simple as.

 

[KingKenny]

https://www.google.co.uk/search?client=opera&q=100mm+pvc+coupling&sourceid=opera&ie=UTF-8&oe=UTF-8

and a can of pipe cement!

Nah, that won't work, will it? Are there not 100mm+ (eg.. 105mm) 'sleeves' or similar on the market that would connect two 100mm diameter pipes together?

 

[PRETEND SPARKS]

Yes you can mate, you can get an internal connector for 100mm duct

 

[baldsparkies]

Appreciate we cant see the set up, but would you be able to adapt a 100 mm flexi hose cut to size and used as a sleeve over both 100mm side of adaptor and fan spigot.

 

[KingKenny]

Thanks PS!! - Do you have a link anywhere? - Amazon, Screwfix, etc... Anywhere that can deliver quickly.

 

[KingKenny]

May be able to, yeah! - Good call.

 

[KingKenny]

Thanks to everyone who has replied so far - Great lads.

Much appreciated.

 

[Andy78]

What sort of distances are the original ductings that these fans are going to be extracting through, and are 100mm axial fans suitable for this ?

 

[willy fixit]

Duct tape!

 

[Corbs]

What sort of distances are the original ductings that these fans are going to be extracting through, and are 100mm axial fans suitable for this ?

prob not and to the op why not use a 100mm duct coupler there very easy to get hold of (even toolstation have them ffs http://www.toolstation.com/shop/Electrical/d190/Ducting/sd3083/Straight+Round+Pipe+Connector/p99325

http://www.ebay.co.uk/itm/EXTRACTOR-FAN-DUCT-COUPLER-CONNECTOR-4-100mm-/250793234645 )

 

[Corbs]

Duct tape!

until it gets warm and peals

 

[JulianC]

Don't buy a 100mm duct connector as you'll find this is the same diameter as what you've already got. What you need to connect a 100mm fan spigot to a 100mm adapter is nothing more than a short length of 100mm duct. Screwfix/Toolstation et al will sell you a 300mm length for a little over a quid. A few minutes with a hacksaw and a coving mitre block and you'll have a nice little pile of suitable couplers. Tape the joints or, preferably, use sealant and a couple of short self tappers.

And don't use a 100mm axial fan. Waste of time. There's a few decent 100mm centrifugal units available these days.

 

[Corbs]

Don't buy a 100mm duct connector as you'll find this is the same diameter as what you've already got. What you need to connect a 100mm fan spigot to a 100mm adapter is nothing more than a short length of 100mm duct. Screwfix/Toolstation et al will sell you a 300mm length for a little over a quid. A few minutes with a hacksaw and a coving mitre block and you'll have a nice little pile of suitable couplers. Tape the joints or, preferably, use sealant and a couple of short self tappers.

And don't use a 100mm axial fan. Waste of time. There's a few decent 100mm centrifugal units available these days.

at 98mm no they arnt you need to look at the type you get because some are for flex and some are for solid 100mm pipe

 

[JulianC]

at 98mm no they arnt you need to look at the type you get because some are for flex and some are for solid 100mm pipe

You sure about that?

 

[Geordie Spark]

Duct tape!

Good lad!!!

Gaffer Tape (duct tape) the answer to almost all of life's problems!!