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Duct & Vent Cleaning
Duct cleaning considers both of the following services:
  • Horizontal and vertical dryer ducts
  • Vertical ducts to rooftop units (RTUs) or makeup air units
While the dryer duct cleaning is a routine maintenance activity that typicallay occurs once a year, the vertical duct cleaning is a major maintenance activitywhich usually occurs less often than once a year and is often treated as a capital expense rather than an operating expense.

The frequency of cleaning of the main duct runs connecting to the rooftop units (RTUs)  will depend on a number of factors, including:
  • Whether any concerns have been expressed about the indoor air quality
  • Whether the RTUs  are air makeup units or air handling units
  • Whether any major renovation work has occurred in the building (creating drywall dust, etc).
  • Whether there have been any major water leaks that entered into the duct system and may have saturated any particles that have collected in the duct walls
  • Whether any major construction work has occurred in the neighbourhood around the building
For example, It is recommended that the main ducts be cleaned after a major renovation/rehabilitation project that disrupts the drywall and causes fine drywall particles to enter into the duct system.

In a standard residential application and under normal operating conditions, the ducts from/to the RTUs should be checked and cleaned every 5-15 years.


Scope
Duct and vent cleaning includes the following activities on the  assets:
  • Removing dust from hallway ducts.
  • Removing lint from dryer vents.
  • Indoor air quality.
The following assets are typically subject to de-energized service:
  • Make-up Air Unit
  • Vertical ducts
  • Horizontal ducts

Attributes
Duct cleaning has the following general attributes:
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Fig. Interior of the ducts before the cleaning.


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Fig. Interior of the ducts after the cleaning.


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Fig. Rooftop make-up air unit.

See also:


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