pvc hose length?

[monkey5]

is there a maximum length of hose you can have on a bathroom extractor fan?

 

[NozSpark]

It's about 3m for an axial fan, but can be longer for centrifugal ones...

If you have a long run you'd be better off using some 4" soil pipe and a bit of flexi at each end to connect up.

 

[SPECIAL LOCATION]

If too long with flexible ducting you have to be wary of condensation moisture traps...

Over the course of time big amounts of water can build up!

The strict answer to the length would be..

Refer to manufactures instructions.

 

[Adrian]

3 meters for most fans

every 90 degree bend counts as one meter

if you pass uninsulated duct through the loft you will need to fit a condensation trap to the duct if longer than 1 meter

 

[monkey5]

It's about 3m for an axial fan, but can be longer for centrifugal ones...If you have a long run you'd be better off using some 4" soil pipe and a bit of flexi at each end to connect up.

what the difference between axial fans and centrifugal fans please?

 

[NozSpark]

In simple terms Axial fans are low pressure/volume, while centrifugal fans have higher pressure/volume rates. This means that centrifugal fans are used where you might have longer ducting runs or need a higher volume of air rto be moved.

 

[monkey5]

In simple terms Axial fans are low pressure/volume, while centrifugal fans have higher pressure/volume rates. This means that centrifugal fans are used where you might have longer ducting runs or need a higher volume of air rto be moved.

thankyou

 

[PC Electrics]

You don't say what kind of length you are trying to extract along. This

http://www.screwfix.com/prods/41379/Heating-Cooling/Extractor-Fans/Manrose-Showerlite-Centrifugal-Chrome-White-35W-Shower-Fan-Kit

kit is pretty good - I've used it up to 5m.

I like the suggestion of using soil pipe to give a smooth run.

If the run is even longer you could always use two fans spaced out.

I've also used this:

http://www.screwfix.com/search.do;jsessionid=1HISL1DMP0QIQCSTHZOCFGA?_dyncharset=UTF-8&fh_search=98482

and found it effective, but it has no over-run timer.

Don't forget to lay insulation over your ducting to keep condensation down. Or use insulated ducting:

http://www.screwfix.com/search.do;jsessionid=1HISL1DMP0QIQCSTHZOCFGA?_dyncharset=UTF-8&fh_search=90765

 

[monkey5]

its about 4m, think if i have to take the long route i might go for the in line fan. im hoping to go directly thru the wall but the only place is just above the window where im expecting to fing a massive concrete lintel hence the reason im looking for an alternative ie into loft across loft space and thru gable end.

 

[NozSpark]

If you have to go 4m then I go for an in line centrifugal fan..

I've just put a Vent Axia one in and it is very quiet!!

the fan (4") cost me

 

[monkey5]

If you have to go 4m then I go for an in line centrifugal fan..I've just put a Vent Axia one in and it is very quiet!!

the fan (4") cost me

 

[NozSpark]

I got it from a local independent wholesaler..

It was just a standard inline model and didn't come with any duct or grills

 

[Apache]

I got it from a local independent wholesaler..It was just a standard inline model and didn't come with any duct or grills

like this but cheaper

http://www.screwfix.com/prods/72566/Heating-Cooling/Extractor-Fans/Vent-Axia-ACM100-Inline-18W-Bathroom-Fan

 

[PC Electrics]

Monkey,

Take a good look at that kit I pointed you to. I believe it will satisfy your requirements all in one box! And only

 

[monkey5]

Monkey,Take a good look at that kit I pointed you to. I believe it will satisfy your requirements all in one box! And only

 

[PC Electrics]

I install it upside down by mounting it to the rafters rather than joists. this has the added benefit of decoupling the fan from the ceiling somewhat and reducing transmission of the motor noise.

I've identified other, better 'engineered', methods of avoiding condensation problems.

 

[monkey5]

i install it upside down by mounting it to the rafters rather than joists. This has the added benefit of decoupling the fan from the ceiling somewhat and reducing transmission of the motor noise.Good idea

i've identified other, better 'engineered', methods of avoiding condensation problems.

what were they?

 

[PC Electrics]

From my first reply:

Don't forget to lay insulation over your ducting to keep condensation down. Or use insulated ducting:

http://www.screwfix.com/search.do;js...h_search=90765

 

[monkey5]

From my first replyon't forget to lay insulation over your ducting to keep condensation down. Or use insulated ducting:

http://www.screwfix.com/search.do;js...h_search=90765

o right. theres not any isulation up there just some gravel looking stuff so might go for the ducting.

thanks again