Bathroom extractor fan - undersized roof vent?

Joined
20 Nov 2007
Messages
308
Reaction score
5
Location
Durham
Country
United Kingdom
Hi all,

I put a 5” inline extractor fan (Manrose MF125T) in our main bathroom, with a 5” vent in the ceiling near shower. However it doesn’t seem to have a great airflow, certainly no better than the 4” fan in the en suite. Yes, there’s room below the door.

One reason may be that the the roof tile extractor vent only has a 4” spigot, so I had to use a reducer just before it. Would this be causing a significant issue, and would adding a 2nd roof tile vent beside this one help? Then I can use a Y splitter and have the 5” fan exhausting through two 4” vents.

Alternatively, anyone know where I can get a Marley mendip extractor vent with a 5” spigot?

Any thoughts welcome
 
Sponsored Links
Joined
1 Dec 2006
Messages
5,340
Reaction score
521
Location
Cumbria
Country
United Kingdom
"Would this be causing a significant issue,"

No. Have you set the speed to high?
 
Sponsored Links
Joined
11 Jan 2013
Messages
5,268
Reaction score
1,110
Location
Durham
Country
United Kingdom
Cool. Have you had a look at the duct- is it kinked or full of fluff or birds nest? Thats the only significant choke point, you get better performance if all the duct is on the exhaust side but at the cost of more noise
 
Joined
27 Jan 2008
Messages
19,653
Reaction score
1,886
Location
Llanfair Caereinion, Nr Welshpool
Country
United Kingdom
In the last house I had problems, in this house I don't and I at first could not work out why. Then it twigged, new house no gap bottom of cubical door only at top, old house gap both top and bottom. I realised it was the chimney effect, with a gap top and bottom all the steam/water vapour is transfer to the room, if either top or bottom of shower cubical sealed no chimney effect and room does not get as damp, or no cubical also does not transfer the moisture.

If you reduce the vapour into the room likely the existing is enough.
 
Joined
1 Dec 2006
Messages
5,340
Reaction score
521
Location
Cumbria
Country
United Kingdom
Have you checked that the ducting has not split during installation? If you hold a sheet of A4 paper close to the vent does it suck it up?
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links

Similar threads

Top