BOMI Air Handling, Water Treatment & Plumbing Systems Practice Test 2026 – Your All-in-One Guide to Exam Success!

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How is load defined in a duct system context?

Load is the static pressure in the duct.

Load is the resistance a system must overcome to accomplish its job.

Load in a duct system refers to the resistance the system must overcome to move air at the required flow. It’s the total pressure the fan must develop to overcome all losses—friction in the ducts, bends, fittings, filters, dampers, and any equipment in the path. This concept captures the energy the system needs from the fan to deliver the design airflow.

Static pressure, velocity, or the pressure drop across a single device describe parts of what the load consists of, but they aren’t the full definition. The load is about the overall resistance the fan has to overcome, not just one metric or a single component.

Load is the velocity of airflow.

Load is the pressure drop across a device.