Methods 5, 6, & 7: Traverse Methods

Method 5: Pitot Traverse

Pitot	Rating	Comments
Overall Value		Residential systems typically do not have straight duct lengths needed for good results, very time consuming. More useful for "quick checks" of velocity (not accurate) and for commercial flow measurement.
Recognized by Standard 310	No	Not ecognized by ANSI/ACCA/RESNET.
Residential Accuracy		If traverse is done correctly with all points and enough straight run, on the order of 15%.
Consistency		Hard to get consistent results in residential across systems and different techs.
Equipment Cost	$$	Price varies depending on accuracy of manometer/pressure gauge.
Time (Min)	15 to 20	Time consuming if you follow the standard traverse requirements. Some software available will allow entry of duct cross-sectional area to measure pressure and calculate velocity and CFM.

Mini-vane Anemometer	Rating	Comments
Overall Value		Residential systems typically do not have straight duct lengths needed for good results, very time consuming. More useful for "quick checks" of velocity (not accurate) and for commercial flow measurement.
Recognized by Standard 310	No	Not ecognized by ANSI/ACCA/RESNET.
Residential Accuracy		If traverse is done correctly with all points and enough straight run, on the order of 15%.
Consistency		Hard to get consistent results in residential across systems and different techs.
Equipment Cost	$$	Price varies depending on manufacturer, but typically $600 - $800.
Time (Min)	15 to 20	Time consuming if you follow the standard traverse requirements. Some software available will allow entry of duct cross-sectional area to measure pressure and calculate velocity and CFM.

Hot-wire Anemometer	Rating	Comments
Overall Value		Residential systems typically do not have straight duct lengths needed for good results, very time consuming. More useful for "quick checks" of velocity (not accurate) and for commercial flow measurement.
Recognized by Standard 310	No	Not ecognized by ANSI/ACCA/RESNET.
Residential Accuracy		If traverse is done correctly with all points and enough straight run, on the order of 15%.
Consistency		Hard to get consistent results in residential across systems and different techs.
Equipment Cost	$$	Price varies depending on manufacturer, but typically $600 - $800.
Time (Min)	15 to 20	Time consuming if you follow the standard traverse requirements. Some software available will allow entry of duct cross-sectional area to measure pressure and calculate velocity and CFM.