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How is the centrifugal blower turned?

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The centri...

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Baseboard hot water heat is an example of ____________________ heat.

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natural-dr...

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The simple way to check for airflow is to see if you can feel the airflow at a distance of about ____ from each register.


A) 2 to 3 ft
B) 3 to 5 ft
C) 5 to 8 ft
D) 8 to 10 ft

E) A) and B)
F) A) and C)

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Branch ducts should always use what component to balance the air to the individual areas?

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An instrument that is commonly used on air distribution systems is the anemometer, or ____.


A) velometer
B) manometer
C) pyrometer
D) ammeter

E) None of the above
F) A) and B)

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What is an air conditioning system's capacity in tons, if the supply air is moving through the 12" x 24" main supply duct at a velocity of 400 ft/min?

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The reason for using a reducing plenum system is to ____.


A) reduce maintenance costs
B) reduce the operating cost of the system
C) provide easier means of fastening the takeoff fittings
D) maintain a constant pressure throughout the length of the trunk duct

E) C) and D)
F) All of the above

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The main drawback of the extended plenum system is that the velocity of the air is lower as the air reaches the last takeoffs on the extended plenum.

A) True
B) False

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Each foot of duct offers a known resistance to airflow which is called ____________________.

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Describe the plenum system and explain why it is economical from a first-cost standpoint.

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The plenum system has an individual supp...

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A device used to put trunk duct or extended plenum sections together is called a drive clip.

A) True
B) False

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When is insulation required on air ducts?

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If the air temperatu...

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Why is the airflow from a register not the same across the entire surface?

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It depends on how th...

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Airflow pressure in ductwork is measured in inches of ____.


A) mercury pressure
B) water column
C) air pressure
D) mercury column

E) B) and C)
F) None of the above

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A duct system is pressurized by what three pressures?

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Static, to...

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Showing 21 - 35 of 35

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