HVAC 310 Flashcards
Which type of fans have a low noise emission and are suitable for restaurant exhaust or where air contains moisture or dust ?
Backward Inclined Blades Fan
Duct construction 110304B
Name the 7 different pressure and their 3 classifications
in Inches of Water Column and seal classifications
Low pressure, 1/2 - 1 - 2 (C)
Medium Pressure 3-4-6 (B)
High pressure 10 (A)
Duct construction 110304B
What need to be done before designing the ductwork
Load calculation and the overall type of distribution system.
Duct construction 110304B
What placement should the screws have on round pipe
Minimum of three screws should be placed on duct of diameter of 14inches or less and uniform intervals of at least 15inches along the circumference for higher diameter duct.
Duct construction 110304B
what is the Gyrth joint?
Beaded sleaved joint (aka connecting collar)
Duct construction 110304B
what type of joint is the most popular on round pipe.
Slip or Lap joint is the most popular.
Duct construction 110304B
What is another name for companion flange used on pipe with a diameter of over 60 inches.
Vanstone flange.
Duct construction 110304B
Butt weld is the strongest joint and can be used on all pressure classes.
true
Mechanical air movement and control 110401C
Type of fan that have low noise emission and is suitable for restaurant exhaust system or where air contains moisture or dust.
Backward inclined blades.
Mechanical air movement and control 110401C
How is the location of the motor determined?
By facing the drive side of the fan. W,X,Y,Z.
Mechanical air movement and control 110401C
What should be the length of the splitter damper?
1.5 times the small duct width.
Specifications and schedules and schedules 110304C
How would the size be shown for duct acoustically lined on a print?
Inside dimension, need to be upsized for ordering.
Specifications and schedules and schedules 110304C
You are asked to order a duct 16 by 20 with 2 inches of acoustic insulation. what size will you order.
20 by 24.
Specifications and schedules and schedules 110304C
How would acoustic insulation be shown ?
doted lines.
Specifications and schedules and schedules 110304C
When velocity exceed 4000fpm what should be done to the acoustic insulation?
metal nosing on edge of the duct.
