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