Air quality on campus

Air exchange

Air exchange rates, fresh air/recirculated air ratios, and air filtration are factors in providing air quality that keeps the University safe. The University’s buildings are designed to ASHRAE standards which set requirements for HVAC systems.

Air exchange rates differ between buildings, but Facilities Management has reviewed existing systems to implement enhancements where possible and ensure they are operating and maintained in a way that maximizes their performance based on their design.

Air filtration

The University utilizes air filtration as part of its set of controls to protect the University community against COVID-19.

The University has reviewed guidance provided by Nova Scotia Public Health, Health Canada, Centers for Disease Control and Prevention (CDC), APPA, and the American Society of Heating and Air-Conditioning Engineers (ASHRAE).

According to guidance from these organizations, HEPA filters are recommended in a limited number of scenarios. Recommendations for considering HEPA filtration include:

• Enhancing natural ventilation is not possible,

• Mechanical ventilation is not possible, and,

• Physical distancing is not possible.

• High-risk transmission areas (for example, areas frequently inhabited by people with a higher likelihood of having COVID-19 and/or an increased risk of getting COVID-19)

The air filtration methods used are in-line with guidance provided by Public Health and recommendations from sector-specific industry associations (for example - APPA and ASHRAE) and have been implemented taking consideration for the University’s specific context (for example - existing infrastructure and occupancy).

The University utilizes different ratings of filters in-line to help achieve highest possible MERV ratings without sacrificing airflow.