Wind Loads

[v2]

How should wind loads be applied to Roof Top Units (RTU)
these are mechanical A/C units usually an Air Handler Unit (AHU) or a Condensing Unit (CU) that are usually about 10.0'x7.5'x5.5'?

1. Should they be treated as an enclosed box and apply load on the windward, leeward and roof side of it?
or
2. Should it be treated as a sign structure with positive wind pressure on the windward side only?

I usually use option #1 but I have seen #2 being used. I would like to know if I am over designing here.

Thanks




V2

 

[boo1]

In states with high wind loads like Florida, you can see wind resistance requirements of Chapter 16 of the Florida Building Code or:

http://www.dca.state.fl.us/fhcd/fbc/notices/wind_resistance_notice2_0602.pdf