#21. Will the HVS System work the same with the internal doors closed?

No, air circulation throughout the house is required for maximum efficiency; so internal doors should be left open.
Other Questions that might be of intrest ...
  1. How long until I know whether or not the Weiss HVS unit is working?
  2. Can a Weiss HVS be installed in a home with cathedral ceilings?
  3. What is a Fan?
  4. Can the home handyman install the unit?
  5. How Much Air Do I Need?
  6. Why is a part of my home still damp even with the internal doors open?
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Due to the variation between cities and countries, we have to keep the advice fairly general, and you should check your local requirements.