Frequently asked question

How often should air conditioning ducts be cleaned in an office building?

The short answer first, then the table to decide it in your building.

By Limpieza de Ductos PanamáOctober 19, 20268 min readShare

Short answer

There is no fixed frequency: the EPA does not recommend cleaning ducts routinely but only when needed, and the reference for an office building is to inspect periodically (the ANSI/ASHRAE/ACCA 180 standard sets minimum inspections by component) and to clean when the inspection finds substantial visible mold, vermin, obstruction by dust or particles coming out of the registers.

The answer in a table

What is observed in the building	What applies
Substantial visible mold in sheet-metal ducts, vermin, obstruction or particles from the registers	Clean, and correct the cause of moisture E-02
Mold on internal fiberglass insulation	Replace the material E-02
Construction, remodeling or relocation	Clean before start-up (technical criterion) E-31
None of the above	Do not clean on a schedule: inspect periodically E-02 D-03

What is checked regularly

What does have backing for a routine are the filters, coils and condensate pans. The EPA BASE study, in 97 office buildings, associated infrequent cleaning of coils and pans with more eye symptoms (OR 1.7) and headache (OR 1.6): it is an association, which is why the routine focuses on those components and not on a duct calendar. E-03

How to decide it in your building

Inspect. A camera inspection shows the inside of the ducts and leaves photographs.
Compare with the criteria. With the table above and the detail in the technical guide.
Decide and measure. If cleaning, with containment and with airflow and pressure drop before and after.

For more detail: when to clean ducts and how it should be done, duct cleaning in corporate offices and the camera inspection.

On this site

Air conditioning duct cleaningScope, symptoms and causes
Camera inspectionThe real condition before deciding

Climatiza and Radar Panamá

Duct cleaning in the banking district (in Spanish)Climatiza
Commercial, industrial and residential HVAC services (in Spanish)Climatiza
Air duct cleaning in Panama: when and how to checkRadar Panamá
Office air conditioning not cooling: what to checkRadar Panamá

Keep reading

When to clean ducts and how it should be doneIndication criteria, inspection and method requirements.Open →Duct cleaning in corporate officesWhen, how and what to require.Open →Why does my office air conditioning smell damp?Causes and what to check.Open →Scientific evidence on duct cleaningWhat was measured, what is not proven and what should not be promised.Open →

Related toolDuct inspection plannerEstimate the level of attention your system needs based on use and warning signs.Open planner →

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