Fan Sizing for Room Pressurization
Fan Sizing for Room Pressurization
(OP)
Just need a sanity check. When sizing an air handler for a room that is to be pressurized, I must add that pressure to the fan external static, correct? In other words, let's say that my duct and other external losses amount to 3"W.C. Let's also say that I want to pressurize the room to 0.25"W.C. (pretty high, but just as an example). When selecting the AHU, I will need to tell the manufacturer that I need so many CFM @ 3.25"W.C. external static - correct?





RE: Fan Sizing for Room Pressurization
Brian
RE: Fan Sizing for Room Pressurization
RE: Fan Sizing for Room Pressurization
I have a personalized opinion here. Most of the times, we tend to be redundant in duct design. Ex. rounding up to nearest even number, high roughness factor, future requirement and FOS. In this cases, you are already running your fan to the right of the design point and 0.25", if not considered initially, will help you to get the operating point to the left a bit.
After all, it is your own judgement.
RE: Fan Sizing for Room Pressurization
RE: Fan Sizing for Room Pressurization
Jabba