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One thing that really helps is giving the extremely hot air someplace to go by putting in openable windows or doors as near as possible to the peak of the roof. The bigger the opening, the better. If you do this to both ends of the building, you might even get some cross ventilation. A cheap box fan in a window opening pushing outside air into the barn would really help a lot and I would not think that it would come in contact with much dust. Moving air is a lot easier to work in when it is hot. Lots of haymows I have worked in have almost no air movement at all. I have heard of hay dust igniting explosively, but have never actually seen it, or the results of it. Most of the haybarn fires I am aware of have been from bad wiring or wet hay spontaneously combusting. Or kids smoking or fooling with fireworks or just playing with matches. That stacking of hay in the peak of a barn is rough duty. I always hated it, especially in the afternoon. Sweat would just roll off everyone and mix with hay dust. We often went swimming in the late afternoons in haying season. But opening up the peak helped a lot in our barn. On many large, old barns, they built cupolas (sp?) near the center of the roof at the peak. The cupolas had louvers that excluded birds, but let the hot, rising air out. I hayed for one of our neighbors in high school that had one of those barns with a cupola that was in good repair. It really helped the heat problem and as the barn was filled, you could actually feel a slight breeze upward near the cupola.
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