i use a whole house fan. since the office, which is where my tank is, is in the back of the house, if i leave the office door open and the front door open, it acts like a regular whole house fan pulling air from the front door through the whole house and pushes it out along with the office air into the attic which then vents through the attic eaves, this keeps the whole house cool, and also lowers there temperature in the attic. if I close the office door and open just the office window, I can clear out the sauna temp and humidity in about 2 minutes, without effecting any other part of the house. it's that fast. i thank the exchange is like 2000cfm or more.