Method 4: Flow Hood on Return
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| Flow Hood |
Rating | Comments |
|---|---|---|
| Overall Value | 
|
Easy to use but very expensive as a system flow meter. May need a larger passive hood for higher flow rate in a single returns and powered flow hood for lower flows of multiple returns |
| Recognized by Standard 310 | Yes | Recognized by ANSI/ACCA/RESNET. |
| Residential Accuracy |
|
Good accuracy if used on return flows with no duct leakage.
Per 310: Only allowed on Grade 1 Duct Leakage results. |
| Consistency |
|
Generally Inconsistent readings if leaky ductwork. |
| Equipment Cost |
$$$$$ | Very expensive (~$3000+) for a flow hood. |
| Time (Min) | 4 to 8 | Fast and easy to use. |
