New office fit-out not cold: supply grille boxed in by ceiling works
The office had just been fitted out, and one zone never cooled properly. New fit-outs can create airflow problems even when the aircon equipment is healthy. When the layout changes, the air path changes too, even if the equipment was not touched.
By Team Snowflake | Reviewed 14 Jun 2026
Case summary
Mitsubishi Electric Ducted2 years oldOfficeMarina South, Singapore
- Concern
- Client thought the new system might have been installed with low gas.
- Previous advice
- Client expected gas checking because the room was warm
- Found
- Supply airflow blocked by new ceiling boxing
- Key check
- Compared airflow at each grille and inspected the ceiling route after the fit-out
- Result
- After the ceiling route was corrected, airflow improved and the meeting room cooled with the rest of the office. Once the route was corrected, the symptom matched the diagnosis: the same system could cool the room when the supply path was restored. That made the fix a fit-out coordination issue, not an aircon replacement issue.
What we were told
After the office fit-out, one meeting room never got cold. Other rooms on the same system were fine.
What we checked
Because the problem was limited to one room after fit-out works, we compared airflow between rooms before checking the refrigerant side. The comparison between rooms kept the diagnosis grounded. If other rooms on the same system were comfortable, the fault was more likely in the route to that room than in the whole outdoor system. We also checked the ceiling changes against the old layout, because fit-out works can quietly turn a shared airflow zone into a blocked room.
Other rooms on the same system cooled normally.
The meeting room supply grille had weak airflow.
Ceiling boxing from the fit-out partly blocked the supply path.
The ducted unit and outdoor side were operating normally.
What we found
The aircon was producing cold air, but the new ceiling works restricted the path to the meeting room grille. The room felt warm because not enough conditioned air entered the space. The ceiling works created a local bottleneck. Cold air was available, but the meeting room was no longer receiving enough of it. That makes the user experience look like low cooling capacity even when the system is still producing cold air elsewhere. The clue was that nearby spaces on the same run were more comfortable, which would be unusual if the whole system had lost capacity or refrigerant. The problem followed the new ceiling boundary, not the aircon equipment boundary.
What fixed it
We advised adjusting the ceiling opening and grille route instead of topping up gas. Once the airflow path was opened, the room should be balanced again with the rest of the office. We recommended correcting the air route before any refrigerant work because gas would not overcome a blocked supply path. The office needed coordination between aircon and ceiling works, not a blind service package. After the route change, the next sensible check would be room balance, because the aircon should only be judged after the room can actually receive the air.
Outcome
After the ceiling route was corrected, airflow improved and the meeting room cooled with the rest of the office. Once the route was corrected, the symptom matched the diagnosis: the same system could cool the room when the supply path was restored. That made the fix a fit-out coordination issue, not an aircon replacement issue.
What this case teaches us
Weak airflow needs the path checked first
- A warm room after renovation can be an airflow path issue, not a refrigerant fault. After fit-out works, compare the affected room with nearby rooms on the same system.
- Check whether the vent still has a clear route into the room. A vent can be present but still ineffective if ceiling boxing or partitions block the route behind it.
- Layout changes matter. Partitions, ceiling boxes, and grilles can change how cold air reaches the space. Layout context matters. Send photos of the ceiling, grille, and new partition line, not just the controller.
Related reading
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