The roof peak is 13', so height hasn't been a limitation.
The electric fans are theoretically for air circulation, but I have not really used them. I do use similar fans in my orchid greenhouse, but haven't felt the need for the tomatoes. I have an thermostatically controlled louver panel on one end near the roof peak and fan on the other peak to provide cross ventilation. I also have a mister system; seldom used as well. But mostly, I regulate temperature in hot weather by removing the vinyl panels that form the walls, leaving only stainless steel mesh that allows much air flow.
The hydro unit is not heavy at all. It actually holds only a couple gallons of nutrients and the plastic pipe is not heavy. Those metal nursery tables could support dozens of these units.
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