Loadstar
Platinum Member
Kinda looks like a old furnace and some flex you acquire for less than $200. 
Reheating makeup air is not a big deal. As it pushes in air your exhaust is working even better off of a pressurizing building. Makeup air is just as simple. Plus you will be happy in hotter days because you are pushing air in and pulling air out. Air moving makes a sweating body's evaporative cooling work much better. I work on a lot of welding spot coolers, dust collectors, exhaust and make up air at factories. The big boy stuff is not real elaborate just simple push air in shove air out.
Reheating makeup air is not a big deal. As it pushes in air your exhaust is working even better off of a pressurizing building. Makeup air is just as simple. Plus you will be happy in hotter days because you are pushing air in and pulling air out. Air moving makes a sweating body's evaporative cooling work much better. I work on a lot of welding spot coolers, dust collectors, exhaust and make up air at factories. The big boy stuff is not real elaborate just simple push air in shove air out.