Extractor fan advice, bathrooms

[0000]

I need to replace two old Greenwood airvac extractor fans, any advice would be appreciated.

I have nearly finished renovating my bathrooms. I disconnected the current extractor fans, to clean them out, and make the renovations easier.

I don't like these fans. They are noisy, not particularly efficient, and clunky.

Due to the size of the back, I'm not sure what to do where modern fans are more compact.

The building is fast construction, new build. I own the flat not the exterior wall. Here is a picture of what I'm talking about

The other one the vent turns a corner but is otherwise the same.

Are there adapters to fill that space, or will I have to cut something to fit? It is basically a hole behind there.

The second part of the question is what do you recommend? I hate the noise. It is a problem in the whole block. Noisy, clattering fans. The cut-out doesn't work well.

I see there are different categories of fan, what are the pros, and cons of each type?

I'm looking for silent, economical, efficient, convenient to fit.

Thanks very much, in advance.

 

[OwainDIYer]

if it's ducted you need a centrifugal fan

Xpelair DX400T or similar. They are more expensive than the cheap'n'cheerful axial fans that builders fit.

 

[0000]

if it's ducted you need a centrifugal fan

Xpelair DX400T or similar. They are more expensive than the cheap'n'cheerful axial fans that builders fit.

I think that is what I had. Can they be silent, or are they always prone to clatter?

 

[secondtime]

i like greenwood cv2GIP.

 

[0000]

i like greenwood cv2GIP.

Is it applicable? I'm looking for soemthign to that fits that location easily.

I am curious about continuous flow. Whether it is worth it.

 

[0000]

There are short ducts, one turning a corner.

One shower room is extremely small, so needs good ventilation.

 

[0000]

if it's ducted you need a centrifugal fan

Xpelair DX400T or similar. They are more expensive than the cheap'n'cheerful axial fans that builders fit.

The reviews I read of this is it is noisy.

 

[0000]

I'm hoping this more detailed schematic/photo will help

Note the duct length is approx 320mm, and the small clearance to the ceiling.

The other bathroom can wait.

Any advice would be appreciated, or any further information you would like just ask.

 

[ban-all-sheds]

I have nearly finished renovating my bathrooms.

Apart from re-tiling...

 

[0000]

I have nearly finished renovating my bathrooms.

Apart from re-tiling...

I'm not doing any. If you must know the ceiling was plastered (after a leak from the flat above), I re-grouted some of the tiling. I re-did the floor, etc.

Anyway that is not what I'm looking for help on.

 

[Aragorn84]

use the TLC fan calculator here:

https://www.tlc-direct.co.uk/Technical/Ventilation/Ventilation4.html

To calculate the amount of airflow you actually need for your bathroom.

It will also suggest suitable replacement fans from their range, but once you have an flow rate you can search for fans from other suppliers too if none of the TLC ones suit.

 

[0000]

@Aragorn84 that is a really helpful answer thank you.