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Grammar School

Air Cleaning
In HVAC an IAQ control strategy to remove various airborne particulates and/or gases from the air. The three types of air cleaning most commonly used are particulate filtration, electrostatic precipitation, and gas sorption.

Air Conditioner
A device used to control temperature and humidity of the air.

Air Handling Unit (AHU)
In HVAC refers to equipment that includes a blower or fan and heating and/or cooling coils

A substance capable of causing an allergic reaction because of an individual's sensitivity to that substance.

In HVAC the device in an air conditioner that distributes the filtered air from the return duct over the coil/heat exchanger. This circulated air is cooled/heated and then sent through the supply duct, past dampers, and through supply diffusers to the living/working space.

British Thermal Unit (BTU)
The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit, equal to 252 calories.

CFM Cubic feet per minute
HVAC term for the amount of air, in cubic feet, that flows through a given space in one minute. 1 CFM equals approximately 2 liters per second (l/s).

A device used to compress air for mechanical or electrical power production, and in air conditioners, heat pumps, and refrigerators to pressurize the refrigerant and enabling it to flow through the system.

Condenser Coil
The device in an air conditioner or heat pump through which the refrigerant is circulated and releases heat to the surroundings when a fan blows outside air over the coils.

Condensing Unit
The component of a central air conditioner that is designed to remove heat absorbed by the refrigerant and transfer it outside the conditioned space.

HVAC term for controls that vary airflow through an air outlet, inlet, or duct. A damper position may be immovable, manually adjustable or part of an automated control system.

A device for reducing the level of humidity in a room or home.

The round or rectangular tube(s), generally constructed of sheet metal, fiberglass board, or a flexible plastic-and-wire composite, located within a wall, floor, and ceiling that distributes heated or cooled air in buildings.

Evaporator Coil
A network of tubes indoors filled with refrigerant that removes heat and moisture from the air.

Filter (air)
A device that removes contaminants, by mechanical filtration, from the fresh air stream before the air enters the living space. Filters can be installed as part of a heating/cooling system through which air flows for the purpose of removing particulates before or after the air enters the mechanical components.

Furnace (Residential)
In HVAC a combustion heating appliance in which heat is captured from the burning of a fuel for distribution, comprised mainly of a combustion chamber and heat exchanger.

Heat Exchanger
A major part of a furnace that transfers heat created in the fuel combustion area to the surrounding air that is pumped into the rooms. This component can develop rust holes or other leaks and problems. To prevent carbon monoxide gas from entering the living areas and for other reasons, the heat exchanger and heating system should be professionally checked regularly.

A device for increasing the humidity in a room or home.

A measure of the moisture content of air; may be expressed as absolute, mixing ratio, saturation deficit, relative, or specific.

A device that removes airborne particles from breathable air. Negative ions are produced and give up their negative charge to the particles. These new negative particles are then attracted to the positive particles surrounding them. This accumulation process continues until the particles become heavy enough to fall to the ground.

HVAC term for an air compartment connected to a duct or ducts.

Preventative Maintenance
Regular and systematic inspection, cleaning, and replacement of worn parts, materials, and systems. Preventive maintenance helps to prevent parts, material, and systems failure by ensuring that parts, materials and systems are in good working order.

The compound (working fluid) used in air conditioners, heat pumps, and refrigerators to transfer heat into or out of an interior space. This fluid boils at a very low temperature enabling it to evaporate and absorb heat.

Return Air
Air that is returned to a heating or cooling appliance from a heated or cooled space.

Return Duct
The central heating or cooling system contains a fan that gets its air supply through these ducts, which ideally should be installed in every room of the house. The air from a room will move towards the lower pressure of the return duct.

Split System Air Conditioner
HVAC term for an air conditioning system that comes in two to five pieces: one piece contains the compressor, condenser, and a fan; the others have an evaporator and a fan. The condenser, installed outside the house, connects to several evaporators, one in each room to be cooled, mounted inside the house. Each evaporator is individually controlled, allowing different rooms or zones to be cooled to varying degrees.

Supply Duct
HVAC term for the duct(s) of a forced air heating/cooling system through which heated or cooled air is supplied to rooms by the action of the fan of the central heating or cooling unit.

A control device that consists of a series of sensors and relays that monitor and activate the functions of an air conditioning and heating system. Generally, older thermostats are mechanical and more recent ones are electronic. See also “programmable thermostat”.

Ton (Air Conditioning)
A unit of air cooling capacity; 12,000 Btu per hour.

A component of a heating or ventilation appliance used to conduct fresh air into, or waste air or combustion gases out of, an appliance or interior space.

The combining of rooms in a structure according to similar heating and cooling patterns. Zoning requires using more than one thermostat to control heating, cooling, and ventilation equipment.

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Call 770-513-8402

I am Madeline, your instruction teller. Now, you must listen to directions if you want to get some treats.

Listen to directions

This is Mrs. Morgan, the Captain's wife. She is here to give you the grammar test after I finish going over the names of stuff with you.
"Sometimes she falls out of the chair".


Thank You Madeline. I will have them whipped into shape before you can say,
" Well shut my dampers, you have a cracked heat exchanger with a clogged evaporator coil due to negative ion particle displacement in your residential split system's furnace."


Oh my, is this room moving... I think I should sit down. Does this chair have a seat belt?

See, I am not the only one it happens too!