Gas heat
This is a pipe where gas flows to the burners and where the burners are mounted.
Manifold
These types of devices are wired in parallel with each other
Power-consuming devices
These pollutants are microscopic, spiderlike insects that that are typically found indoors. They thrive in warm, humid conditions.
Dust mites
This system is made up of components such as the blower, the air distribution system, the return air system, and the grilles and registers.
Forced air system
Oversized duct systems are not only more expensive to fabricate, but can also cause the air to do this as it moves through the duct.
Slow down
For this type of system, the pilot is lit every time there is a call for heat.
Intermittent
This component is meant to bring the heaters into the circuit at the correct time.
Sequencer
This pollutant is a colorless odorless gas. Similar to carbon monoxide but also radioactive. Commonly comes from uranium in the soil breaking down.
Radon
Since the pressure in a duct system is too small to be measured in PSI, we use this unit of measurement. Where 27.7 of this is equal to 1 PSI.
Inches of water column
This type of duct work comes in two styles, flat sheet and pre-fabricated round section. It also has an aluminum foil backing.
Fiberglass, Fiber board.
This type of system has a pilot that is lit all of the time.
Standing
This type of diagram shows the location of each component as it actually appears to the person installing the equipment.
Pictorial diagram
This pollutant is caused by incomplete combustion in an oil or gas-fired system. Caused by the lack of oxygen or incomplete mixing of fuel and oxygen.
Carbon monoxide
This is the type of pressure in a duct system, is the same as the pressure on an enclosed vessel and can be thought of as the air pushing against the walls of a duct section.
Static pressure
This duct fitting is the connecting point between the main trunk line and the branch duct.
Take off
Made of two dissimilar metals welded at one end. Also called a "hot junction"
Thermocouple
This type of heating uses panels for ceiling installations that are usually made of gypsum board and contain wire heating circuits.
Radiant heating panels.
This term is used to describe the process of supplying air by natural or mechanical means. This air should be supplied to the occupant's breathing space.
Ventilation
This type of measuring device is used to measure the air pressure in a duct system.
Manometer
Duct systems contain these fittings to help balance the air flow in various parts of the system.
Balancing dampers
This type of safety device closes electrical contacts wired to the gas safety valve.
Bimetallic safety device
This component must cycle on before the furnace gets too hot and continue to run until the furnace cools down..
Blower motor
This component is commonly used to reduce the negative effects on system efficiency by transferring both latent and sensible heat between entering and leaving air streams.
This type of fan is used to move large volumes of air at lower pressure differentials. It is often used as an exhaust fan.
Propeller type fan
This action happens in duct work due to the rubbing action of the air against the side of the duct and the turbulence of the air rubbing against itself.
Friction loss