Fans Flashcards
Inlet vane dampers are primarily used in
Non ducted applications
Inlet box dampers are used in clean air applications that use inlet box what are supplied in these box’s
These dampers are supplied with parallel blades
Iris dampers are another damper made for
Round pipe
To ensure dampers due not fail due to stress they should always be made to standards by
Smacna and ashrae
Different hardware for dampers
Parallel blade bracket
Opposed blade bracket
Opposed blade low bracket
Opposed blade high bracket
Blade gauage is based on
Blade size and static pressure
Multi blade dampers come as 2 ways
Parallel or opposed blade
When are opposed blade dampers required
When volume control is required
Partial blade dampers should not be used for volume control because
Uneven airflow
Attenuator terminals are box’s often used in high velocity single duct systems they are used where it is necessary to
Slow down air
When making any type of branch fitting it is good practice to install some type of damper in order to guide the air what is it his called
Splitter damper
Air supplied to single duct vav is normally supplied at what temp
55f
Heating coils can produce heat two ways
Electric or by water
Describe a dual duct terminal
A supply of heated air and a supply of cooled air brought to a mixing box
What is a terminal unit
A VAV box that regulates the amount of air supplied to a zone
What’s is a VAV bypass purpose
When the amount of air supplied to the VAV box can’t be controlled
How do you minimize turbulence
Air must enter or leave fan uniformly
Rotation and discharge is determined by what factor
Drive position
Radial blades are self cleaning. What does this make them good for?
Suitable for material transport such as wood chips and grain systems
What are crossflow fans good for?
It’s separate zones
additional fans classifications
Mix flow fans
Roof ventilators
Crossflow blowers
Backward inclined fans are good for what
For restaurant exhaust systems and where air contains moisture or regular dust
Radial blade fans are good for
For materials handling high-pressure industrial applications
Forward curved fans are good for
Low pressure systems
