One of the bedrooms on second floor is not getting enough cold air or hot air. Air flow is ver weak. Every other room in the house is Ok. I saw few videos on internet and it said first check if air vent is blocked. I checked that and it is not blocked. Other thing internet says is to verify if damper is in right position and for that to verify I don’t know which pipe from furnace is pumping air into which room.
How do I identify which outlet from furnace is pumping air into which room?
Here are the images of my furnace in the attic in case if I didn’t use right terminology: https://imgur.com/a/IKiSrLS