HRV and CFM
The energy auditor has just installed an HRV in our house. The blower door test was approximately 2.5. The HRV is installed in the attic with intakes from two of the bathroom fans. The intake is from the outside and after the HRV connects to the forced air return.
Here are my questions specifically regarding the HRV
1) How fast should the HRV run or how much air should it pull when its run continuously?
2) Since the intake into the HRV is from the bathroom fans, the HRV is connected to a timer switch within the two bathrooms that for either 20/40/60 minutes will make the HRV run at full speed. The cfm in the bathrooms was measured at 30 cfm when the HRV was on max power. This seems way underpowered. One bathroom is 1755 cubic feet, and the other is 792 cubic feet. What’s the best strategy to ventilate these bathrooms?
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