Hey Pros- I'm seeking a check on my logic. I'm finishing out part of a basement into an ADU that will have a bath fan and a stackable washer/dryer. The remaining part of the basement contains a natural draft water heater and another laundry set up. The water heater and existing dryer have coexisted for years with no problems. My concern is that the addition of that dryer and bath fan could depresurize the apartment and cause the water heater on the other side of the wall to back draft. I have (sorta) airsealed the partition wall between the ADU and the CAZ but want to do more to prevent the apartment from succking on the rest of the basement. I'm thinking of installing a Panasonice spot ERV to run at a low continuous flow with hope that its intake will provide make up air if the bath fan and dryer are running at the same time. In other words, they would suck through the ERV before sucking on the rest of the basement. I can do a worst case pedressurization test once everything is in but we're not there yet.