Engineering Strategies for Airborne Diseases

H V A C S Y S T E M S T R A T E G I E S

O7

RECOMMENDED SEQUENCE OF OPERATIONS UPDATES

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Increase the duration of building purge mode / flush mode to increase dilution. Start ventilation mode before occupancy.

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Run fresh air systems during nights and weekends.

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Run restroom exhaust continuously 24/7. Increase restroom exhaust rates if exhaust and make up system capacity allows.

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Monitor and control building humidity. Revise dehumidification and humidification modes and sequences as necessary.

❑ Maintain equal space pressures on all floors in multi-story buildings to avoid cross contamination between different floors. ❑ Maximize supply air reset sequence for buildings equipped with this sequence. This would allow more outdoor air and more air changes within the building.

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Disable demand-controlled ventilation and unoccupancy / vacancy sequences during scheduled business hours where possible. Use CO2 sensors for particle measurement only.

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Bypass Heat Recovery Systems with enthalpy wheels, where cross contamination cannot be avoided.

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Avoid cycling fan coil units on/off. Switch to constant volume operation if needed.