Why is air filtration important in HVAC systems, and how does a higher MERV rating affect pressure drop?

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Multiple Choice

Why is air filtration important in HVAC systems, and how does a higher MERV rating affect pressure drop?

Filtration in an HVAC system serves to remove contaminants from the air, which improves indoor air quality for occupants and helps protect equipment. Using a filter with a higher MERV rating means it captures more and smaller particles, giving you cleaner air. But that finer filtration also creates more resistance to the moving air, increasing the pressure drop across the filter. If the blower or system isn’t adjusted to compensate, this higher resistance can reduce airflow. Energy use isn’t automatically lower with a higher MERV; it can increase because the fan may have to work harder or run longer to maintain the desired airflow. So the best statement recognizes both the IAQ benefits and the trade-off of increased pressure drop that may affect airflow if not addressed.

Filtration in an HVAC system serves to remove contaminants from the air, which improves indoor air quality for occupants and helps protect equipment. Using a filter with a higher MERV rating means it captures more and smaller particles, giving you cleaner air. But that finer filtration also creates more resistance to the moving air, increasing the pressure drop across the filter. If the blower or system isn’t adjusted to compensate, this higher resistance can reduce airflow. Energy use isn’t automatically lower with a higher MERV; it can increase because the fan may have to work harder or run longer to maintain the desired airflow. So the best statement recognizes both the IAQ benefits and the trade-off of increased pressure drop that may affect airflow if not addressed.

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