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Design versus measured

How far off is that room?

Put the design airflow from the drawings beside the reading at the diffuser. The percentage between them is the difference between a balancing job, a duct repair and an equipment problem.

Two numbers

From the mechanical drawings, the balance report, or the diffuser schedule.
Taken with a balancing hood at the diffuser, with the system in normal operation.

A comparison, not a balance report. A real report covers every diffuser, the fan, the static pressure and the outside-air rate.

Delivered

75%

Well short of design. Worth measuring the whole branch before anyone looks at the equipment.

  • Check the damper position at the branch and the diffuser
  • Look for crushed flex, a disconnected boot or a closed fire damper
  • Compare against the other rooms on the same run
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What a balance report is

Four things it tells you

  • Design versus measuredEvery diffuser and return, listed side by side, so nobody argues about which room is short.
  • Fan and static pressureWhether the fan is doing what it should, and what the system is fighting to move air.
  • Outside airHow much fresh air is actually arriving, which matters for occupancy and for smells.
  • What was changedDamper positions and settings recorded, so the next person inherits facts instead of guesses.

When it is worth doing

After a tenant improvement, after equipment is replaced, when one suite is always the problem, or when a building has been complained about for years and nobody has ever measured it. Those are the four times a balance pays for itself quickly.

We do the measuring, set the dampers and hand over the numbers. If the readings show something we cannot fix by balancing — a fan too small, ducts too tight — we say so instead of chasing dampers.

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A technician adjusting a balancing damper above an open ceiling tile