07-02-2006, 02:47 AM
This 200 square foot turret sits atop a 2 story building. It is accessed via a spiral staircase. On warm days and even in the winter, hot air rises and collects in the turret. The roof of the turret is metal and difficult to access from the outside. The inside of the turret is conical with about a 12' pitched (12/12) ceiling. Retro'ing an exhaust fan through the turret roof is not practical. So here is my idea. I can remove the ceiling and access the 2x12 ceiling rafters. The walls of the turret are framed in 2x6. Could I not install an exhaust port in the ceiling and connect several 1" or so "ducts" into that port and come down through the wall plate in different locations and then reassemble the several ducts into one 4" duct that would exit at the roof below the turret which I can access. In other words, a mini-duct exhaust system. I don't know if this type of system exists but the HVAC sub and I were brainstorming and thought this would be a way to remove hot air from the ceiling. Can you install various mini exhaust ports that blow out a lower exhaust port on another roof?