Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

alternative to mhvr

  • 27-01-2013 2:42pm
    #1
    self_builder
    Registered Users, Registered Users 2 Posts: 26 ✭


    Hi all,

    Just wondering if there is a cheaper/viable alternative to MHVR? We are starting a self-build in a few weeks and have the usual budget constraints. Hoping to insulate and airtight as well as possible (within our budget) but am concerned about ventilation. Vents in windows? Open windows? Electric fans? Is there a point in trying to get a reasonable level of airtightness without MVHR?

    Would really appreciate any advice.


Comments

  • #2
    blast06
    Registered Users, Registered Users 2 Posts: 228 ✭✭blast06


    I'd put it like this ..... insulate to a Ferrari standard but if you do not have MHVR then it will be like a well insulated block of Swiss cheese with all the holes required for vents. Holes in windows no longer allowed afaik


  • #3
    Phirstclass
    Registered Users, Registered Users 2 Posts: 14 ✭Phirstclass


    If the airtightness of the dwelling is being designed to fall somewhere between 1.5 - 2 m3/hr/m2 then a Demand Controlled Ventilation system might be an appropriate alternative for roughly a third of the cost of a MVHR unit.


  • #4
    self_builder
    Registered Users, Registered Users 2 Posts: 26 ✭self_builder


    Thanks Phirstclass. I hadnt heard of DCV before. I'll look into it.


  • #5
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    DCV is really more suitable for large open plan rooms like lecture rooms, theatres etc, in a multiroom dwelling its not that effective.


  • #6
    sydthebeat
    Subscribers Posts: 42,170 ✭✭✭✭sydthebeat


    from the point of view of "heat recovery" theres no real viable alternative to MHRV at the moment.

    there are some systems being tried out but nothing really marketable right now.

    If you are just talking about ventilation systems well theres the 3 main types; hole in the wall; demand control; or mechanical with heat recovery.
    The first two offer no recovery of heat back into the dwelling so whether you consider that an alternative option is up to you.

    do your homework on the MHRV systems and talk to people who have the systems installed.


  • Advertisement
  • #7
    simon334
    Registered Users, Registered Users 2 Posts: 29 ✭simon334


    CJhaughey wrote: »
    DCV is really more suitable for large open plan rooms like lecture rooms, theatres etc, in a multiroom dwelling its not that effective.

    HI

    Can you explain this a little more?

    Many thanks


  • #8
    john_cappa
    Registered Users, Registered Users 2 Posts: 1,371 ✭✭✭john_cappa


    http://www.aereco.ie/new-video-on-demand-controlled-ventilation

    A decent video (of course they are selling DCV so obviously the video sells the system well)


Advertisement