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    • 19 May 2015 at 11:42 am #31922
      Anonymous

        Hi all,

        Can someone give me some pointers concerning sizing of intake and exhaust louvres for a commercial MVHR?

        The flow is around 2400m3/h3.

        For non-PH buildings I would normally design to the following;
        External weather louvre with A-rating rain protection
        Approx 1.5m/s face velocity for intake (keep low to prevent rain being pulled in)
        Approx 2 m/s face velocity for exhaust

        These parameters give a healthy pressure drop (less than 20Pa) on the louvre.

        The problem is, to get these velocities requires a large duct diameter (800mm), which increases the area for heat loss quite considerably.

        From my understanding, for PH dwellings, velocities of circa 3m/s are ok for intakes/exhausts.

        What do people think?

        Chris

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