Comparing HVAC System Air Flow Methods

Air Flow
Comparison
TrueFlow
Grid
TESP
(External Static
Pressure)
Pressure
Matching
Flow Hood Traverse Temp Rise
Temp Split
Indoor Coil
Pressure Drop
Overall Value
Recognized by Standard 310 Yes Yes Yes Yes No No No
Residential
Accuracy
Consistency
Equipment
Cost
$$$ $ $$$$$ $$$$$ $$ $ $
Time (Min) 5 to 10 5 to 10 8 to 15 4 to 8 15 to 30 5 to 20 4 to 8
  • There are several methods for measuring HVAC system air flow.
  • For residential HVAC systems, consider the four methods recognized by standard 310 (ANSI/ACCA/RESNET standard for grading new installs).
  • When determining overall value, we consider 4 main criteria — Real-world Accuracy, Consistency, Cost and Time.
Rating Legend
Poor Performance
Best Performance
$ Low Cost (~$150)
$$$$$ Highest Cost ($3000+)
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