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 | Updated 28 Jul 2026

Case summary

Mitsubishi Electric Ducted2 years oldOfficeMarina South, Singapore

Concern: The office manager thought the new system might have been installed with low gas.
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.

Questions this case answers

Our office fit-out left one meeting room warm. Is the system low on gas?

Check the air path before the refrigerant. Other rooms on the same system cooled normally, which would be odd if the outdoor side had lost charge. Airflow at the meeting room supply grille was weak, and ceiling boxing from the fit-out partly blocked the route behind it. Cold air existed; it could not arrive.

Can a vent be open and still deliver almost nothing?

Yes. A grille can look entirely normal while the route behind it is squeezed by new ceiling work. That creates a local bottleneck, so the room feels underpowered even though cold air is being produced a few metres away. The problem followed the new ceiling boundary, not the equipment.

How do I tell an airflow problem apart from a capacity problem?

Compare the warm room against neighbouring rooms on the same system. If those are comfortable, capacity is an unlikely culprit and the route into that one space becomes the suspect. A genuine loss of system capacity would show up everywhere, not only in the room that changed shape during renovation.

Should the aircon side or the ceiling contractor handle this?

The ceiling route needs correcting first. Topping up gas cannot push air through a boxed-in path, so the practical step was reopening the supply route and rebalancing the room. That made it a coordination job across trades. Once a room can receive air, the system can be judged fairly.

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Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.

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