Heat, temperature and pressure
Heat that is transferred by moving a medium such as air or water is known as this
Convection
Voltage can be produced when a conductor passes through this area
Magnetic field
Humidification generally relates to the process that causes water to do this into the air
Evaporate
This tool is used to measure both air pressure and gas pressure using inches of water column
Manometer
The fitting that is used to change the size of duct work is called this
Transition
Under standard conditions, this substance will freeze at 0° C
Water
This device is made of a primary winding, a core made of thin steel plates and a secondary winding.
Transformer
Over 1000 compounds are found in this type of air pollutant.
Tabacco smoke
Complete combustion uses heat, air and this
fuel
This type of duct come in sizes up to 24Inches
Flexible duct
This unit defined in the early 19th century, measures the amount of heat required to raise 1 pound of water by 1 degree
Btu
This device is used to store electrical energy. Two common types are the start and run.
Capacitors
The cause for poor health problems associated with poor indoor air quality is known as this term
Sick building syndrome
air that is pulled it to the combustion chamber to support combustion is known as this type of air
Secondary
Static, total and velocity are types of these in a duct system
Pressures
A thermometer is used to measure temperature. A barometer is used to measure this type of pressure
Atmospheric
This law states that like charges repel while unlike charges attract.
Law of charge.
Care should be taken when handling UV lamps because they contain this compound
Mercury
An improper spark gap is a common problem when using this type of ignition system
Direct spark
This material is required when there is a temperature difference of 15 degrees
Insulation
Some heat transfers result in a change of state without a temperature change. This is known as hidden heat or this type of heat.
Latent heat
This device is designed to prevent the circuit from overloading and overheating. Most contain a strip of metal with a higher resistance than the conductor
Fuse
Sensible heat from exhaust air to the intake air is done by using this type of device
Heat recovery ventilator
Annual fuel utilization efficiency is a way to measure this
Furnace efficiency
Electrical power should always be shut off at this point and locked out before performing work
Distribution box.