Why do some domestic heat recovery systems only have grilles in the rooms with moisture like the kitchen and bathroom? Aren’t they meant to pump fresh air into dry rooms like the bedroom too? 2A02:C7F:EA3E:8000:D046:E85D:FE32:6A85 (talk) 01:30, 11 April 2021 (UTC)[reply]

Some of those grills might just be ventilators connecting to the outside, to let fresh air in. But in that case it is not a "domestic heat recovery system". These would have to be modified for that situation. Air can circulate under doors to move between rooms to find the return path. Graeme Bartlett (talk) 07:39, 11 April 2021 (UTC)[reply]

Even if the grills are connected to a heat recovery system? How does a system like that allow air to move under doors? 2A02:C7F:EA3E:8000:1509:8071:E91F:B94A (talk) 09:26, 11 April 2021 (UTC)[reply]

Are you saying that when the door is closed, there is no flow of air in the bedroom? 11:15, 11 April 2021 (UTC)

I assume that you are talking about Heat recovery ventilation. In bathrooms and in kitchens it is important to remove excess humidity and fumes. Graeme Bartlett (talk) 23:25, 12 April 2021 (UTC)[reply]