Which statement about purge cycles is accurate?

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Multiple Choice

Which statement about purge cycles is accurate?

Purge cycles refresh the air by briefly bringing in outdoor air to displace stale air and contaminants in the ductwork and occupied space. This helps ensure each ventilation or start‑up sequence starts with clean air and reduces the carryover of stale air from previous occupancy or idle periods. They’re used during system start-up, after occupancy changes, or in periods when ventilation-only operation is active, so fresh air can be introduced before full operation continues. It’s not about purging the entire building every cycle, nor is it limited to nighttime operation, nor is air continually being vented outdoors; the purge is a short, controlled burst of outdoor air to refresh the system.

Purge cycles refresh the air by briefly bringing in outdoor air to displace stale air and contaminants in the ductwork and occupied space. This helps ensure each ventilation or start‑up sequence starts with clean air and reduces the carryover of stale air from previous occupancy or idle periods. They’re used during system start-up, after occupancy changes, or in periods when ventilation-only operation is active, so fresh air can be introduced before full operation continues. It’s not about purging the entire building every cycle, nor is it limited to nighttime operation, nor is air continually being vented outdoors; the purge is a short, controlled burst of outdoor air to refresh the system.

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