Dust Collection Return Air
From the original questioner:
One of the reasons we are installing this new (to us) system is for the risks you point out. The new system is a Carter-Day baghouse with explosion vents. We have installed an abort gate to divert smoke/fire to outdoors in the case of a problem as well as a backdraft gate on the inlet side. When we are done, there will be spark detection and corresponding deluge water spray in the ducts. Thanks for the observations.
From contributor G:
The spray urethane that I am familiar with degrades rather quickly in sunlight. In a couple or three years, your cyclone might look rather leprous and most of the insulation may have fallen off. If you can either find a sunproof foam or cover it, that would be better. Does the manufacturer have any suggestions? Does the manufacturer either warn against or void warrantee for what you propose? Check with them.
From contributor D:
Go to your vendor as suggested. I have set up several dust systems over the years, and the conventional thought from the vendors was that the velocity of the air did not allow for the heat to migrate much. Little to no heat loss. We are in central Indiana.
In winter, the return air felt cold, but that was due to velocity. We put an adjustable louver frame over the outlet, and could direct it up in the winter, to circulate the heated air rising up to the ceiling, and down in the summer, to add to air movement in the shop.
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