That's what I was going to ask - is there or was there at some time a need for a door that size?
Another thing to consider is this. Once when we had problem with our water system I mentioned to the pump man who was doing the repair that I was going to replace the outswing door on the pump house with an inswing so the door wouldn't flop around in the breeze when we had it open. He said doors on small pump houses such as ours should have an outswing door in case of a main waterline break. If the main line broke the pump would be supplying 70 gallons of water a minute until the pump house filled up with enough water to push the door open, push the weakest wall out or flood the electrical controls to the point where a breaker tripped. An outswing door would act as a pressure relief valve in that situation.
I never heard of that happening and don't know how much of a chance there is that it could, but I guess it's at least a theoretical possibility.
