A ducted air supply opening size is the area of the opening plus the area of the mesh or bars.

The measured airflow through a blower door fan that is used to calculate air changes per hour is called _____.

If the cells in an electronic air filter are not thoroughly dried after washing, electrical arcing may occur when system is turned off.

Dirt buildup on fan motors can cause ____?  Give two examples.

A(n) ____ test shows how effectively the building envelope minimizes the amount of unconditioned air passing through into conditioned space.

What is an example of a government subsidy?

A command economy 

Headline:  Saudis, other oil giants announce surprise production cuts.  What happens to the equilibrium price and quantity of oil?

If demand stays the same, a decrease in supply would result in 

Use the graph above to indicate what will happen to the supply of apples given the following scenario:   iRobot unveils a new machine that is able to detect and pick ripe apples that costs half of what a human worker would cost.