Server stack sits in a closet just off the floor. There is a heater duct opening behind it. At the top of that cavity is a 4" elbow turning up, a temp control

Server stack sits in a closet just off the floor. There is a heater duct opening behind it. At the top of that cavity is a 4" elbow turning up, a temp controlled fan an a pipe up through the ceiling and into the attic. Open end has screen to keep any rodents out. Door has a small vent to let air in. Works well, I don't hear the noise unless I'm right next to the door. Closet also has the wifi and other stuff in it.