The size of air ducts is dependent upon many factors including:

In HVAC duct system design, ___________ refers to the amount of straight duct that would generate the same amount of resistance to airflow (i.e., pressure drop) as a fitting, such as an elbow, tee, or transition. HVAC systems typically have both straight sections and various fittings, and while straight ducts have predictable resistance based on length and diameter, fittings can introduce additional friction and turbulence, increasing the pressure drop.

______ refers to the reduction in air pressure that occurs as air flows through an HVAC system, such as ducts, filters, or coils.

Duct Sizing – Equal Friction Method The airflow rate in a section of duct is 2000 cfm. The static pressure drop is 0.20” WC. Find the size (diameter) of the duct using the equal friction method. A copy of the equal friction chart is provided for convenience.

Air throw is defined as what?

An HVAC system may include the following:

HVAC applications typically measure volumetric air flow in what units?

A ______ is a specific section of a building that requires separate temperature control.

In an HVAC system, a certain portion of the return gets expelled into the outside environment and replaced with fresh air. Typically, what percentage of air gets expelled and replaced?

A nurse is providing care for a client who has multiple organ dysfunction syndrome (MODS). Which of the following actions is the priority when planning care for this client?