Central Air duct does not blow

Question

We moved into a new house last year, the central A/C works great for all the rooms (even for closet) but we have a problem in just one room. There is almost no air flow coming from that room's air duct.

The room is the northeast corner of the house, so it does not get almost any sunlight (Just east wall in the morning and there is no window on that wall) but still the room 3-4 degrees hotter than the rest of the house. (We also had the same problem during winter, all around the house was warm, but not that room)

I placed paper strips to each duct outlet to see the air flow, all the papers move except that room. That way I know that there is no air flow in that room.

I closed some other air ducts to increase airspeed, but so far didn't help.

What should I do to find & fix this problem?

Mazura · Answer

Disconnected duct-work, a closed shut-off louver (somewhere in the duct-work, not at the register), or it's the longest and hardest-to-run stretch, therefore possibly undersized to fit in the space or a poor job done connecting it, are all likely culprits. Contract someone who has troubleshooting experience and an inspection camera. Standard duct cleaning service companies aren't likely to have either. Re-balancing the system will not solve the problem as you have tried that already (unless it is a hidden closed louver).

If I had to guess (if it's not just broken duct-work), it's the longest, hardest-to, smallest diameter run in the house, running in horribly mangled (kinked) 6" flexible. Solution, replace with ridged.

Central Air duct does not blow

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