Exam 37: Air Distribution and Balance

Why is the airflow from a register not the same across the entire surface?

Baseboard hot water heat is an example of ____________________ heat.

Branch ducts should always use what component to balance the air to the individual areas?

When is insulation required on air ducts?

The main drawback of the extended plenum system is that the velocity of the air is lower as the air reaches the last takeoffs on the extended plenum.

Each foot of duct offers a known resistance to airflow which is called ____________________.

The reason for using a reducing plenum system is to ____.

A device used to put trunk duct or extended plenum sections together is called a drive clip.

Describe the plenum system and explain why it is economical from a first-cost standpoint.

What is an air conditioning system's capacity in tons, if the supply air is moving through the 12" x 24" main supply duct at a velocity of 400 ft/min?

The simple way to check for airflow is to see if you can feel the airflow at a distance of about ____ from each register.

An instrument that is commonly used on air distribution systems is the anemometer, or ____.

Airflow pressure in ductwork is measured in inches of ____.

How is the centrifugal blower turned?

A duct system is pressurized by what three pressures?