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24 Cards in this Set
- Front
- Back
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What is the advantage ofusing a duct work system for air conditioning rather than several window airconditioners?
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Provides even temperature throughout the house.
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What are three characteristics of a duct system that has been designed and installed properly? |
Little draft felt Little noise heard Even Temps felt |
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What are the two sides of a duct system called? |
Return and supply
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What type of air pressure does each side of the system have? |
Return = negative pressure
Supply = positive pressure |
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What type of blower does the central air conditioner and furnace have? |
Centrifugal
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What is the duct called that connects the furnace and trunk line? |
Plenum |
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What is the duct called that goes down the length of the house to distribute the air to the individual ducts that goes to the rooms? |
Trunk Line |
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What are the ducts called that deliver the air to the individual rooms? |
Branch |
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What are the four basic types of duct systems? |
1. Radial duct system
2. Extended Plenum duct system 3. Reducing Plenum duct system 4. Perimeter Loop duct system |
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What is the easiest and cheapest type of duct system to install? |
RadialDuct System
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Where will the radial duct system be located in a basement or crawl space? |
Crawl space |
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What is the maximum length of a trunk line on each side of the furnace with an extended plenum system? |
24 feet |
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What is the advantage of using a reducing plenum system in a large house? |
Maintainsair velocity all the way through the trunk line.
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What type of duct system is good to use with a slab home? |
Perimeter Loop Duct System
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What are the four outlet locations of ducts? |
1. High inside wall
2. Low inside wall 3. Ceiling 4. Floor perimeter |
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Where would the return be located for a high inside wall register installation? |
Outside wall |
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Would a high inside wall installation be better for heat or cooling? |
cooling |
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What type of outlet installation gives the worst airdistribution?
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Low Inside Wall
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What is the disadvantage of a ceiling outlet installation?
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Can create drafts on occupants
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What is the best type of outlet installation for residential homes?
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Floor Perimeter Registers
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Compared to the pressure in the house, is the air in the supply negative or positive pressure?
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Positive |
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What is the pressure in the return duct compared to the house pressure?
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Negative |
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What is the component that creates these pressure differences in the supply and return?
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Blower |
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What is the unit of measurement we use to measure air pressure in the duct?
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Inches of water column
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