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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.
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General: How much air moves through a hole in the wall

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  1.  
    • CommentAuthorGreenfish
    • CommentTimeDec 11th 2014
     
    Ok from a green building perspective holes in the walls are bad news, but does anyone know for a given size wall vent how much air is expected to enter/leave the building through it?

    It will vary given the wind speed and direction, and how many other holes there are etc., but some rule of thumb must exist for the building regs to conclude that a ventilation area of 850mm2 per kW of wood burner is necessary in a room. What air flow is expected? Likewise how many ACH does opening a window create? Anyone know?
    • CommentAuthortony
    • CommentTimeDec 11th 2014
     
    Someone once told me that a 600mm x 600mm square hole in an otherwise airtight house equated to 1 ach at 50 pa

    a whole door removed or half a patio door missing = 10

    all the regs are probably belt and braces approach then double it. most likely no air vent would be necessary in any but the most airtight of homes if the guy above was right!
  3.  
    Below 5kW I think you are fine with no hole. Mine is 5-8kW and I did not need one.

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