HVAC Module Six Air Distribution Systems
How long does a basic fiberglass filter last?
1 month
How long does a media filter last?
3-6 months
What is an ideal humidity level for a conditioned space
50%
A residential systems typical throw is usually
6 feet
Residential layouts are usually between
8-10 feet tall
Who sets the Industry standard for determining the specific size of the ductwork to be used?
ACCA Manual D
Which of the following is a round, spiral, flexible duct that can be stretched and bent to the needs of the contractor?
Flex
A smaller unit used in a residential or light commercial application that has a coil assembly in the same cabinet with the blower is commonly called?
a fan coil unit (FCU)
What will increase the static pressure and reduce the CFM capability of the fan?
a lengthy duct run or numerous elbows
What is it called when a contractor uses the diameter and length of ductwork along with dampers to adjust the volume ad velocity of air leaving the register?
balancing
What adds moister by air moving through a wet media filter
bypass humidifiers
What does CFM stand for?
cubic feet per minute
What restricts airflow reducing capacity and causes excessive electrical consumption?
dirty air filters
Which of the following is the process of capturing and retaining airborne particles from the air stream?
filtration
Witch of the follow HVAC systems needs ductwork?
gas furnace
Which of the following is designed to allow a specific amount of air to enter the return ductwork?
grille
The bathroom and kitchen exhaust are examples of what?
house ventilation
What can happen if the duct system is poorly designed and the velocity at the register is too high?
it can create noise issues
What is the basic fiberglass air filter in the return duct of a residential designed to do?
keep the blower, motor, and evaporator coil clean
How long does the electronic air cleaner filter lasts?
permanent, needs seasonal cleaning
What introduces warm steam into the air?
steam humidifiers
When fitting ductwork pieces together what is a collar used to connect?
the ductwork to the center, main trunk to the system
What is static pressure?
the resistance of the air by the ductwork
What is the term for the distance that air is designed to travel from the register into the conditioned space?
throw
What is the purpose of the inner liner on insulated flex?
to keep fiberglass from eroding into the air stream
A perfectly sized air conditioning system will not perform correctly with the incorrectly sized ductwork system.
true
Which if the following is installed facing the evaporator coil and kills mold, viruses, and bacteria that are exposed to it
ultraviolet light
Which of the following does not have fiberglass insulation and is typically used in exhaust venting
uninsulated flex
