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H.R.V. and legoinnaires.

  • 02-09-2009 9:37pm
    #1
    gears
    Registered Users, Registered Users 2 Posts: 758 ✭✭✭


    A friend as just had a HRV installed and he tells me that one of the reasons he went with this particular model is that it has or he's been told it has a system for dealing with legoinnaires....

    I've never heard this before, so does anyone know if this is an issue.


Comments

  • #2
    gears
    Registered Users, Registered Users 2 Posts: 758 ✭✭✭gears


    Bump...

    Apologies for the bump, just this has slipped on to the second page of topics and I was hoping some fresh eyes this week might have an opinion on this, even if it's to say you never heard of it.


  • #3
    funkydunkey
    Registered Users, Registered Users 2 Posts: 101 ✭✭funkydunkey


    it could be an issue, and if that model of heat recovery unit combats legionnaires all the better. But, and this is only my opinion, I would imagine that a HRV would pose little enough threat as legionnaires disease is most dangerous when in vapour form. So something like a shower head or an aerated tap (especially mixing taps) would be of far more concern. Also, I'd imagine that you shouldn't have water stagnating in a HRU. Do you have any specific info on the system?


  • #4
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    funkydunkey wrote: »
    it could be an issue, and if that model of heat recovery unit combats legionnaires all the better. But, and this is only my opinion, I would imagine that a HRV would pose little enough threat as legionnaires disease is most dangerous when in vapour form. So something like a shower head or an aerated tap (especially mixing taps) would be of far more concern. Also, I'd imagine that you shouldn't have water stagnating in a HRU. Do you have any specific info on the system?

    legionairres will grow at temps above 20 degrees, however it is much more significant in stagnant water around 35 degrees. Its notable that legionella exists below 20 deg but is dormant.

    So firstly, HRV system intake fresh external air and heat it up before it enters the room. Therefore there is no stagnant water present in the process.
    Secondly, the average heat of the air coming into the room will be, at most 20 degrees and more commonly 15-16 degrees. This is assuming a highly efficient system working to its highest efficiency.


  • #5
    gizmo555
    Closed Accounts Posts: 2,948 ✭✭✭gizmo555


    sydthebeat wrote: »
    So firstly, HRV system intake fresh external air and heat it up before it enters the room. Therefore there is no stagnant water present in the process.

    The only liquid water present anywhere in the system is condensate from the extracted air. The incoming fresh air would never come into contact with it and anyway, the condensate is just drained away, so as Syd says there's no stagnant water for the Legionnaire's to grow in.

    Can't see on this basis how Legionnaire's could be a problem with HRV.


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