stand
you can also add more joists(the blue in the diagram)to support more weight and to spread the weight over the floor .on the back wall you could continue the studs(purple)directly under the joists for more support(16" centers on both).where you have access doors double up your header(one of the reds).2 doors one stud doubled,3 doors 2 studs doubled(also known as a cripple).thats the way i made mine to support my 220
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