I have enjoyed lurking in the forum. This is a great resource.
I have a question about make up air in houses. I have a pretty tight house (2200 CFM@50 Pascales), I have bathroom and kitchen fans, fireplaces that I will rarely use and a hot water heater that draws air from the inside. I have geo thermal heatpumps to forced air. I have an ERV/HRV for exchanging air inside/outside that the manufacture says is not appropriate for make up air.
My question is do I need additional part of the ventilation system to add outside air when inside air is expelled by the fans? It is as simple as adding a vent to the return?
Thanks - John