Advice on ducting kitchen extractor fan through air brick

Discussion in 'Kitchen Fitters' Talk' started by duds888, Jul 13, 2018.

  1. duds888

    duds888 Member

    Dear Screwfixers,

    Wonder if any plumbers, electricians or kitchen fitters could advise me on best way to duct kitchen extractor fan through and existing airbrick in my flat.

    Should be able to view some pictures from the following link (click them to enlarge):
    https://www.dropbox.com/sh/js7pw1r0iwnuz09/AADgCDOTftFQxy24bV7YYM_Ga?dl=0

    Image 1: Final kitchen plan. Extractor will be installed into the middle wall unit.
    Image 2: Picture of the same aspect
    Image 3: Air brick from inside with dims
    Image 4: Air brick from outside with dims


    My plan will be to run rectangular manrose ducting flat along the wall, taking 45 degree turns around the column and behind right-hand side wall unit to the centre one for connection with the extractor.

    Manrose ducting:
    https://www.screwfix.com/p/manrose-rectangular-flat-channel-white-110mm/14118


    I would welcome advice on how to achieve this, specifically how to duct through the airbrick to the outside. It’s a cavity wall so aware it needs to be air tight connection.

    I’ve seen double air brick ducting adaptors but the dimensions don’t seem to be compatible. Some examples here:

    http://www.fastlec-pdf.com/product_pdfs/airbricks.pdf
    https://www.bpcventilation.com/whit...U2g2gbYKRg26XrTsq8NzkjAioPWVehAoaAlmOEALw_wcB


    Any help on this gratefully received.


    Many thanks,


    D
     
  2. 14th edition

    14th edition Well-Known Member

    This can be done but you will need to alter the dimensions of the inside vent [I would leave the outside as is and put a solid type tube thro the wall not flexi. The inside vent you will need to make a mounting plate to fit the trunking.
    The big practical issue is that the extractor fan will not be particularly efficient as it is travelling a] distance and b] round bends, both of which reduce the air flow....you may need to get a more powerful fan somehow. Standard fans generally are just designed to push air through a wall. They all have air flow data so check what your extractor can do first!
     
    kitfit1 likes this.
  3. duds888

    duds888 Member

    Hey 14th Edition, many thanks for your reply - super helpful
     
  4. kitfit1

    kitfit1 Well-Known Member

    Don't know know i missed this thread when you first posted it OP. 3 bends in that run, so it will reduce the ducting distance by 1.5m from the manufacturer maximum ducting distance. As you are in a flat, what floor are you on ? Only asking because if you are on the ground floor, there may be other options.
     
  5. goldenboy

    goldenboy Well-Known Member

    Be super careful with that vent. Lots of those are made from asbestos. An often there is a kind of loose fill asbestos inside the opening too.
     

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