bathroom exhaust/ventilation
bathroom exhaust/ventilation
(OP)
I have a 25,000 SF office building with a large restroom. I am locally exhausting it at 10ac about 500 cfm, but am confused as to whether or not I have to make that 10ac (500cfm) up with outside air ventilation through the main air handler coil. It is a VAV w/ reheat application. The bathroom requires only 100 cfm to maintain interior cooling loads. Can I just exhaust the air locally and make it up with transfer grilles from the adjacent conditioned corridor and just ignore the outside air makeup at the coil level? If I don't make this up at the main coil via OA ventilation, then the area would be under a high negative pressure. What do ya'll think??





RE: bathroom exhaust/ventilation
However, you need to make sure your building doesn't go negative as a whole because of the bathroom (and other exhaust).
RE: bathroom exhaust/ventilation
RE: bathroom exhaust/ventilation
RE: bathroom exhaust/ventilation
You're going to have to condition all the OA or make the occupants uncomfortable.
Depends upon your codes as to whether you can use transfer grilles, especially in a corridor used as a means of egress.
RE: bathroom exhaust/ventilation
Think of the building like a control volume. Look at the air entering (ventilation), the air leaving (exhaust and relief) and make sure you don't have more air leaving than entering. Never count on infiltration to make up air. Sometimes you need to provide more OA than 62.1 requirements because there is too much exhaust in the building.
RE: bathroom exhaust/ventilation
Don't rely on infiltration as this is unfiltered and difficult to account as heat load.
RE: bathroom exhaust/ventilation
Just remember to look at your ventilation requirements for the building as a whole and compare the exhaust requirements. If your ventilation outweighs your exhaust, you have enough make-up air and will need to relieve some air. If your exhaust exceeds your ventilation then you need to bring in more make-up air.
RE: bathroom exhaust/ventilation