Pressurization of Room w/ HVAC System
Pressurization of Room w/ HVAC System
(OP)
Does anyone have experience with pressurizing a room when there are also HVAC AHUs in the room? Our HVAC contractor says he plans on pressurizing the room by ducting in air from the outside in conjunction with air from the inside. We weren't sure if this was SOP as we figured air into the AHU would equal air out of the AHU, which would not induce any positive pressure.
Not sure if that's a better option than using a separate make-up air system with fan/filter that blows directly into the room.
Thanks to all.
Not sure if that's a better option than using a separate make-up air system with fan/filter that blows directly into the room.
Thanks to all.





RE: Pressurization of Room w/ HVAC System
If he plans on ducting air in from outside then he probably plans on at least attempting to pressurize it.
RE: Pressurization of Room w/ HVAC System
Having said that, the construction of the room is critical. You will never hold a descent pressure in a room that is not tightly sealed or has doors that are always open, etc.
RE: Pressurization of Room w/ HVAC System
I would put a gravity relief damper to outside that modulates open/close based on space pressure (maintain 0.05+)
hope that helps
RE: Pressurization of Room w/ HVAC System
We do pressurize the space to avoid the outside air/gases enter into the room.
RE: Pressurization of Room w/ HVAC System