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I have a question. I have been asked to estimate the size (thickness/gauge) and specific material of two L-Brackets that will be used to mount a condensing unit on the side of a building. As I am at work and don't have any of my school/ME books at my disposal I am wondering if someone could give me a hand for the time being.

For simplicity's sake, assume the unit to be mounted is a 400 lb. box that is 90 inches in all directions (LxWxD). At this time, it is assumed that the box (condensing unit) will be mounted using two angle iron L-Brackets (one on each end of the box). I have attached a very crude sketch sent to me for a visual representation.

Obviously the weight of the unit normal to the ground (and L-Bracket) is the main factor, but I am also wondering about the force causing some sort of rotation and the bottom of the brackets, as the bracket is only attached to the wall on the vertical portion of it and, I would assume, the whole thing wants to rotate about the base of that unit at the point it contacts the wall.

As you would expect, we are hoping for zero deflection. At the same time, my friend would like to be as cost-effective as possible and not buy extremely over-sized brackets. I mentioned he may want to add braces that cross the bottom of the brackets or trusses of sorts from the front of the bracket back to the wall.

Can anyone provide any insight on how to size the angle iron?

Thanks.

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# Sizing brackets to wall-mount condensing unit

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