HRV wall cap question
user_8675309
| Posted in General Questions on
I have installed Broan #641 wall caps where my HRV duct enters and exits my home. This wall cap comes with a spring loaded damper which I obviously removed from the fresh air intake side. Should I remove the damper on the stale air (exhaust)wall cap? I ask because when I ran the unit on low speed, the damper is at about a 45 degree angle and may be causing a restriction of air flow? I still have time to remove it if reccommended. Climate zone 7 Anchorage Alaska.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
Search and download construction details
Replies
Jon,
It's always best to follow the installation instructions provided by the HRV manufacturer. What brand of HRV are you installing?
A 45 degree angle on the damper doesn't sound too bad -- but ideally, you'll be commissioning your HRV. Commissioning an HRV usually requires measuring the air flow. If you measure the airflow, you'll know the answer to your question.
For more information on this issue, see "Is Your Ventilation System Working?"
HRV is a Broan 160 ECM. Nothing in manual except how far apart they should be.
Assuming the HRV will run continuously, you might save a Watt or 2 by removing the backdraft damper.