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RE: Fixed File Cabinet - Dead Load or Li

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"The difference is that one rolls and the other doesn't. The A/C isn't 
going to end up bunched in a corner somewhere with a lot of other units 
when someone re-models the space or replaces carpets."

An A/C unit won't end up bunched together in a corner somewhere when someone
replaces the carpets, but it might happen when they do some roofing work, do
some repair work on a failing unit, or start adding or rearranging units to
meet a tenant's desire for some extra capacity.  Also, some day it very well
may get replaced with a more efficient model that happens to weigh 50% more.
In my experience all these events are common.  Perhaps part of the
differentiation is that these are owner initiated events and (hopefully)
involve someone in the chain of events that has the foresight to ask a
structural engineer if it will work or not.  Just speculation.  

Paul Crocker, PE, SE

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