Passive ERV for make-up air
I know that make-up air for kitchen vents has been discussed at great length on this site but I have a slightly different problem. We are renovating a house and the plans called for an ERV for bringing fresh air into the house without opening windows to dust and pollen. The HVAC guy has proposed a 90cfm unit ducted into the return of the AC air handler. I don't intend to run the ERV full-time and don't want to run the air handler unless the AC is on. We will have hydronic radiant (floor) heat. I really want the quite and no breezes! But we will also have pretty strong bathroom vents, kitchen vent, dryer and central vac that will suck air out. I want to control where the make-up air comes from. The 90cfm ERV will not be adequate for make-up air for any of these things singly let alone when more than one is running. I would like to find a passive system that would filter and temper incoming air when one of the other appliances is turned on and exhausting air. I want to prevent random air infiltration if possible, especially from the flue, attic or basement. Does anyone know of any way to do this? It doesn't need its own exhaust mechanism since the others would serve that purpose. My HVAC guy is clueless - also as to whether we whould duct the ERV into the air handler or just let it run through the wall somewhere. Thanks so much for any opinions.