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  1. MyWifeNowDave
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    MyWifeNowDave EF Member

    Location:
    Somerset
    Hello all, I'm new to the forum and I was hoping to get a bit of advice please:D

    I'm a plumber and I've put a new fan in my bathroom. The old one was ineffective and didn't clear the steam very well. What I'd like to achieve is to be able to run a shower without the walls and mirror steaming up.

    The new fan is a vent axia acm100t, the fan speed is at the highest setting and the timer overrun is running around 20 minutes after light goes off. I have situated the fan in the loft about 700mm from extraction grill (bathroom end), which is above the shower area. The ducting is insulated ducting and goes down to a soffit vent. All other soffit/roof vents within 1m of extractor vent have been blocked up to stop moisture getting back up into the roof space. I have about a 13mm gap on the bottom of the door to allow a flow of air into the bathroom..... but the walls and mirror still get steamed up, although the room doesn't fill up with steam the way it used to do. The bathroom is only about 1800mm x 1800mm.

    I have just had a shower and the walls are still pretty wet . The heating isn't on at the moment as the stat downstairs is on 20 degrees.....

    Any ideas would be gratefully received as I don't know what else I can do to improve the situation. :grimacing:
     
  2. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    have you no windows in the bathroom!
     
  3. mhar
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    mhar Electrician's Arms

    Location:
    devon
    If you are requiring instantaneous removal of the steam / moisture, it would require quite a draught through your bathroom.

    Wire in a humidistat so that the fan does not turn off until the moisture levels in the air are at an acceptable level
     
    • Like Like x 2
  4. Murdoch
    Online

    Murdoch Electrician's Arms

    Location:
    Woking
    1. Hold a piece of toilet paper in front of the ceiling grill - if it stays there, the fan is working.

    2. Don't be surprised about the moisture on the walls - that's what happens when you introduce warm moist air into a room

    3. Sounds like its better than before.

    4. Unless you have a bigger, or "stronger" fan nothing is likely to change.

    5. Consider adding a heat mat behind the mirror...
     
  5. Phil Thompson
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    Phil Thompson Let us light up your life! Electrician's Arms

    Location:
    Newtownards
    Business Name:
    Brite Spark Electrical
    Or get an inline mixed flow fan with a higher cfm air movement.
     
  6. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    turn the heating up, cut your shower time down to just as long as it takes to scrub up.
     
    • Agree Agree x 1
  7. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    lower the temperature of the shower water!
     
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  8. buzzlightyear
    Online

    buzzlightyear Electrician's Arms

    Location:
    star command
    or put in a 12in fan .
     
  9. MyWifeNowDave
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    MyWifeNowDave EF Member

    Location:
    Somerset
    Thanks guys for the responses.

    So am I being unreasonable to expect no steaming up at all? I thought 220 m3/he would prevent that..... providing I get the airflow? Even tried showering with door slightly ajar to see if that improved things .....and if so put in a low level vent....but it didn't.

    Would changing to a acm150t sort this out (460m3/hr) as every so many months I need to fight back the start of mould..... it's not bad and is easily gotten rid of... but it's bloody annoying though
     
  10. MyWifeNowDave
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    MyWifeNowDave EF Member

    Location:
    Somerset
    What's a mixed flow fan????
     
  11. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    nice picture by the way .where you once with black &white minstrel boys! upload_2017-9-10_12-22-32.png
     
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  12. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    upload_2017-9-10_12-24-37.png
     
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  13. Taylortwocities
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    Taylortwocities Electrician's Arms

    Location:
    Oxfordshire
    If you are trying to suck air out of the room down a 100mm dia pipe then you must have a air inlet to the room of at least an equivalent size.
    otherwise your fan will just be tryin to create a vacuum in the room.

    Ideally, air inlet to the room and the point where the air is extracted from the room should be on opposite sides of where the steam is created.
     
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  14. SWD
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    SWD Gender neutral Electrician's Arms

    Location:
    London
    How many external walls do you have and did you fit a demister pad to the mirror?
     
  15. Rpa07
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    Rpa07 2000 posts - only 46379 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    Are you sure that the whole run of ducting isn't pooled with condensate? If you are then as the others say!
    Sometimes it seems like a fan is pulling the air but it's just trying to push it a against a big puddle of water effectively doing nought.
     
  16. Rpa07
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    Rpa07 2000 posts - only 46379 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    Quite normal for a Sunday night that - enjoyable as well! I'll bet there was a do-gooder responsible for its demise. That'll be another thread!
     
  17. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    when steam meets a cold surface it condenses into water, no matter how much extraction you have.
     
    • Agree Agree x 2
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  18. MyWifeNowDave
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    MyWifeNowDave EF Member

    Location:
    Somerset
    It's all brand new as the old fan was ineffective, the ducting is all new and runs from the fan downwards to the grills. Maybe I need a more powerful fan..... or to lower my expectations?
     
  19. MyWifeNowDave
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    MyWifeNowDave EF Member

    Location:
    Somerset
    It's all brand new as the old fan was ineffective, the ducting is all new and runs from the fan downwards to the grills. Maybe I need a more powerful fan..... or to lower my expectations?
     
    • Like Like x 1
  20. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    I can take long hot showers in my ensuite, using an in-line 100mm extractor fan, with no steaming up :eek:

    Is your ducting fairly straight, with no bends & under 3m total length. Venting out through soffit always causes poor extraction IMO
     
  21. marc8
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    marc8 Electrician's Arms

    Location:
    Essex
    Business Name:
    MTS Electrical Ltd
    hi
    what you need to remember with any fan is the ducting, air will travel along the edge walls of the ducting the smoother the better.
    when the fan pushes the air through the ducting any ridge or obstruction will create system pressure, air being pushed through ducting tends to roll along the edges if it hits an obstruction it will roll back on itself meaning the fan will have to work harder to overcome the system pressure until a point it just does not work.
    with flexible ducting you must stretch it out as much as you can otherwise as above the ridges will make system pressure. if you can use rigid ducting & if required cover in insulation. bigger the fan the more system pressure it will handle.
     
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  22. marc8
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    marc8 Electrician's Arms

    Location:
    Essex
    Business Name:
    MTS Electrical Ltd
    another thing you might want to check is the volume of trickle vents / vents that let air into your house, you have a good fan you have a gap under the door if your ducting is stretched out properly then you need to look at the volume of trickle vents in the house. page 22 onwards approved document F.
    for example 3 bed house 91-100sq meters would require 65000mm EA of trickle vents.
    (>)50m3/(h.m2)at 50 Pa air permeability.
     
  23. Phil Thompson
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    Phil Thompson Let us light up your life! Electrician's Arms

    Location:
    Newtownards
    Business Name:
    Brite Spark Electrical
    You'd need at least 4x the size of hole to intake as you do for extracting so just having the gap below the door is insufficient.

    You either need to leave the door ajar a few inches, or open the window, or both. if the fan grill on the ceiling above the shower cannot hold 3-4 sheets of toilet roll to the grill then you'd likely need a more powerful fan.

    The 4" mixed flow is about £53 plus vat. Just for the fan alone. These are far more powerful than the £20 inline kits.
     
  24. HandySparks
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    HandySparks Trusted Advisor

    Location:
    Hampshire
    Business Name:
    Neish Electrical Services
  25. Phil Thompson
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    Phil Thompson Let us light up your life! Electrician's Arms

    Location:
    Newtownards
    Business Name:
    Brite Spark Electrical
    Then he needs to increase the air flowing into the room to replace the air he want some to remove, otherwise as said earlier, he's just creating a vacuum.
     
  26. surreygirl
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    surreygirl Regular EF Member

    Location:
    hanpton wick
    Business Name:
    none
    Hello I am new too. I am sorry to post thread but I cannot seem to find where I start a thread myself as I have a question to ask! Help
     
  27. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    Go to forums above

    Find the most appropriate category

    Post a thread
     
  28. Taylortwocities
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    Taylortwocities Electrician's Arms

    Location:
    Oxfordshire
    At very top of the page, hit the button that says
    "FORUMS"
    then you'll get a new screen. Hit the button that says
    "START NEW THREAD"

    select the forum you want to post in.

    Simples!!
     
  29. Bubba sparks
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    Bubba sparks New EF Member

    Location:
    Kent
    Hi there.
    If it's any help, all we tend to install is the greenwood Airvac. I've got them in my house for bathrooms and utility. Solid, insulated ducting vented to soffits and they do the job fine. Built in humidistat is a plus. Might be worth a look if you end up changing.
     
  30. UKMeterman
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    UKMeterman Electrician's Arms

    Leave bathroom door open after you have the shower and the fan is on for it's min 10 minute overrun.
     
  31. stevels4
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    stevels4 New EF Member

    Location:
    East Midlands
    "I think we're gonna need a bigger fan"

    IMG_0824.JPG
     
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