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Carpenter Red Seal Exam Prep · Question

A client is concerned about dust entering other parts of their home during a bathroom renovation. What is the MOST effective method for dust containment and negative air pressure within the work zone?

A sealed poly barrier with zippered access creates a contained work zone, and exhausting filtered air outside with a HEPA-filtered air scrubber creates negative

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Question: A client is concerned about dust entering other parts of their home during a bathroom renovation. What is the MOST effective method for dust containment and negative air pressure within the work zone?

Answer options:

  • Sealing doors with painter's tape and plastic sheeting.
  • Using a shop vacuum with a HEPA filter continuously. ✅ Constructing a poly barrier secured with zippers for access and directing a HEPA-filtered air scrubber to exhaust outside.
  • Setting up a fan to blow air out of a window in the work area.

Correct answer: Constructing a poly barrier secured with zippers for access and directing a HEPA-filtered air scrubber to exhaust outside.

Explanation: A sealed poly barrier with zippered access creates a contained work zone, and exhausting filtered air outside with a HEPA-filtered air scrubber creates negative pressure, preventing dust from migrating to other areas, as per CCOHS best practices for dust control.

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