To safely perform zone boosting, the selected zone must be ___ the zone being boosted.

• A. Greater than
• B. Greater than or equal to
• C. Less than
• D. Equal to

Answer: (B)

When you boost a zone, you rely on air moving from higher pressure areas to lower pressure areas. To do this safely, the zone you’re using to provide the boost must not be weaker than the zone being boosted. In practice, that means the boosting zone should have pressure that is greater than or equal to the target zone’s pressure.

If the boosting zone has more pressure, you get a clear push into the target space, helping raise or maintain its pressure as intended. If the boosting zone has exactly the same pressure, you can still route air as needed with proper damper control, and there’s no harmful reverse flow. If the boosting zone is lower in pressure than the zone being boosted, air would flow the wrong way, undermining the boost and potentially causing unsafe pressure imbalances.