RDH Building Science

Ventilation in Multi-Unit Residential Buildings (MURBs) is typically provided by a pressurized corridor system (Figure 1). This method uses a common make-up air unit to provide air to the corridors of each floor and create a positively pressurized space. The intent of the design is for the air from the corridors to pass through the suites to the exterior driven by this pressure difference and the use of exhaust fans. Though this system design is pervasive throughout North America there is considerable evidence that the ventilation design does not perform as intended, resulting in poor indoor air quality and occupant comfort complaints.

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