Go to Forum Home Building Services Intake & exhaust sizing for commercial MVHR

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      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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