I also have a similar question regarding "External Static Pressure".
When viewing BLOWER DATA info on, for example, Trane XV80 gas furnace, External Static Pressure is always a factor on the chart, and is a fairly important one.
Where, and at what point exactly, do you insert test tube in duct? Also, do you insert low tube in R/A duct at the same time as high tube in S/A duct? Is that ".45" you are seeing at that point, your ESP that you are trying to determine?
This exact manner in wich this measurment is performed has always been a big "?" for me, as it seems everybody has a differing view as to how it is correctly performed.
PLEASE HELP! Thanks, Rockhead
