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Duct Static Pressure

Quiz by Robert Birdwell

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10 questions
Show answers
  • Q1
    Where should static pressure readings be taken in a furnace system with added accessories like coils or filters?
    in the middle of the duct system
    by the outdoor unit
    between the furnace and any accessory that is added to that furnace
    at the top of the unit
    30s
  • Q2
    In a duct system, where should the airflow be transitioning to for optimal design?
    diagonally across the indoor unit
    to the front and back of the indoor unit
    in a circular pattern within the unit
    to the left and right, never the front and back of the indoor unit
    30s
  • Q3
    What is the typical range of static pressure indicated by the color-coding in a duct system?
    4 in of water to 6 in of water
    2 in of water to 4 in of water
    less than 2 in of water to close to 7 in of water
    0.5 in of water to 2 in of water
    30s
  • Q4
    Where should pressure readings be taken when evaluating the supply in a furnace system?
    between the furnace and the coil
    inside the duct system
    by the outdoor unit
    at the top of the unit
    30s
  • Q5
    How should static pressure be evaluated after the installation of a furnace?
    use a computer program
    drill holes along the mounting rail below the coil drain pan to evaluate static
    estimate based on the unit's size
    measure from a distance
    30s
  • Q6
    What does the monometer reading of '0 in of watercolumn' indicate in the example provided?
    clogged filter
    low airflow
    high static pressure
    no static restriction in the duct system
    30s
  • Q7
    How can changes to motor airflow influence the static and velocity pressures in the duct system?
    changes will not affect airflow
    changes are purely cosmetic
    changes only affect the temperature
    changes to motor airflow can influence the total external static and airflow
    30s
  • Q8
    In the provided example, what motor torque tap change would be needed for a 4-ton outdoor unit to achieve just over 1,600 CFM airflow?
    tap a
    tap d
    tap b
    tap c
    30s
  • Q9
    What are airflow performance tables based on in HVAC systems?
    the color of the unit
    what did that manufacturer ship in the box
    the outdoor temperature
    the size of the duct system
    30s
  • Q10
    What is the average total static pressure in the example given after adding all the readings and dividing by three?
    .45 in of water
    .25 in of water
    .60 in of water
    .10 in of water
    30s

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