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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Ventilation: Using 6" flue liner for MVHR return ducts

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  1.  
    • CommentAuthorblubb
    • CommentTimeMay 11th 2023 edited
     
    Did anyone here on the forum use a flue liner as the main MVHR return duct?

    I would be very curious to hear about any real-life user experiences with that.

    Two specific questions:
    - is grade 316 steel good enough, or should I go with grade 904?
    - any advice how to join the 6" flue liner to the 160mm Lindab spiral duct?

    Many thanks!
  2.  
    I think Lindab make all manner of reducers/adaptators. A couple of stainless steel self tappers should provide security.
    • CommentAuthortony
    • CommentTimeMay 12th 2023
     
    I much prefer ducts that are complete smooth inside
    • CommentAuthorblubb
    • CommentTimeMay 16th 2023
     
    Hi Tony
    Posted By: tonyI much prefer ducts that are complete smooth inside

    I agree in principle -- this is for using a disused chimney as the return duct -- a straight solid 160 mm pipe won't fit.

    Does anyone know if Lindab use 316 or 904 grade steel? (I am fairly certain 316 but not 100% sure)
    • CommentAuthorblubb
    • CommentTimeMay 16th 2023
     
    Thanks Dominic.
    Tappers make sense.
    Could not find 6" to 160mm adaptor from Lindab though...

    Posted By: Dominic CooneyI think Lindab make all manner of reducers/adaptators. A couple of stainless steel self tappers should provide security.
  6.  
  7.  
    I have to say that I had some near misses with various adaptors, i.e. I bought what I thought would be right but then one wouldn't fit inside another.
  8.  
    Ductstore were also very good for various bits:
    https://www.ductstore.co.uk/acatalog/160.html

    https://www.ductstore.co.uk/acatalog/safe-160_seals.html


    Zinc-plated mild steel reducers with rubber seals to fit spiral ducting tube.

    Reducers, as with all fittings, are male and slip inside spiral tube.

    Lindab safe reducers are not generally held in our own stock. Smaller sizes typically 2-3 working days, larger reducers may take up to 5 working days.
    • CommentAuthorblubb
    • CommentTimeOct 5th 2023
     
    Many thanks everyone for your input!
    •  
      CommentAuthorfostertom
    • CommentTimeOct 5th 2023
     
    I think Lindab do both grades, to order.

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