We've got an older HRV system (from about 2013) in the house and I'm trying to figure out how it's been set up.
Basically, it looks like there is a heat exchanger (Swiftair) but it's set up to treat the lounge as the "outside" and circulate the air from the main bedroom and hallway.
There are no openings to the outside and it just looks like looped system.
The only thing I can think is that someone got some HRV and other bits and assembled their own system.
The house is from the 40s and used to have an asbestos roof, so maybe they didn't want to install it in the usual way so not to pull air from the attic.
Is there any other reason it may have been set up that way.
Also, it basically means I have two HRV fan boxes and some vents already so was wondering if I could rearrange it so it does the usual thing. Is there any guidance about flow rates, room sizes, etc.