Products of poor combustion result in higher than normal levels of:

 When sizing single appliance vents, the tables allow for up to two 90-degree offsets. Each additional offset up to 45 degrees creates a ______% reduction penalty and additional offsets up to 90 degrees creates a reduction penalty of ______%

 Which of the following are approved for connection of gas piping systems to an appliance?

When the water and refrigerant in a heat exchanger flow in opposite directions, it is referred to as ____.

The lanyard on a safety harness must be short enough to prevent you from falling more than:

According to Manual J, the heat that is associated with a temperature change when a building gains or losses heat is called:

Additons, alterations to, or repairs on existing systems shall not cause a system to become

The advantage of using a pump-down control on a commercial refrigeration system is to:

A solenoid is a coil of wire that, when energized, creates a magnetic field which causes some action to occur in an electric device.  Solenoid coils are NOT a component part of which of the following electric devices?

The type of current that controls the contacts in the current relay is: