No hate, and good on you for thinking about it deeply, but this is a terrible idea. The primary thing you want to exhaust from bathrooms is humidity. You want t

No hate, and good on you for thinking about it deeply, but this is a terrible idea. The primary thing you want to exhaust from bathrooms is humidity. You want the shortest, straightest path out of the house for that 100% humid air. Recirculating it will create untold horrors of mold all the way downstream of the bathroom. It’s also unlikely to be allowed by residential building codes, or passed by any inspector.