Grilles, Registers, Diffusers
Used to design when:
1) Using cooling only system
2) Using more than a single diffuser.
What is ADPI. What do the letters stand for?
What are the 3 common purposes of a damper?
Velocity Equals?
What is: CFM/Area.
Air at the discharge would hit you in the back of the head.
What is: How you determine the handing of a Terminal Unit.
3.5Kw, 400cfm, 12,000Btu.
What is: One ton of energy?
Why is this important?
The percentage of air lost due to Buoyancy when selecting a sidewall register for use without a ceiling.
What is: 30 percent.
1.5 hour & 3 hour.
What are the two UL Fire Damper Hour Ratings?
This is used to determine the proper motor horsepower and wiring.
What is: BHP (Brake Horsepower).
Why is this important?
EcoShield.
What is: The name of the innovated liner that is a recycled natural fiber
CFM x 60 divided by Cubic feet of space.
What is: Air change rate?
50 FPM & 150 FPM.
What is the required velocity of air in the occupied zone (50 FPM) & the required velocity of air in the un-occupied zone (150 FPM)?
Why is this different?
Wind Driven rain Louver.
What is: What louver to use when equipment cannot be exposed to moisture.
Is this the only time to use this? What air speed do you consider when selecting this?
These wheels will allow horsepower to peak and then drop off.
What are: Airfoil and Backward Incline wheels.
These coils are crossflow circuited.
What are: 1 & 2 row coils. This allows them to be flippable.
* ASHRAE Fundamentals
ASHRAE 55
ASHRAE 62.1
ASHRAE 90.1
What are: The main guidelines for designing an HVAC system.
Which one is the Ventilation guidelines? What are the others?
Increase ventilation 25%.
What needs to be done if you do not
1) Discharge air above 15 deg. room air temperature.
2) Supply 150 FPM air @ 4.5 ft above floor in Unoccupied Zone. Where is this?
What ASHRAE standard is this related to?
What are: The three most common application of Control Dampers.
This orientation of a fan is used for smoke, grease, fume & moisture exhaust.
What is: An upblast fan.
This prevents air from being trapped in coil circuits.
What is: Why the water is always supplied to the lowest connection in coils.
CFM (Cubic feet per minute) equals?
What is: Room volume (Cubic feet) divided by Air Change Rate.
Ex: 10' x 20' x 8'h = 1,600 Cubic feet
1,600/4 (air changes per hour) = 400 CFM
Sheet Metal or Balancing contractor?
Who should adjust the blades on linear diffusers?
Do you specify this in the specs, schedules or details? Why not?
What are: The two types of material construction are the “CE” Critical Environment Dampers available in.
This defines the performance of the fan.
What is: The Fan Curve.
The lower 50% of the fan curve.
What is: The % range of the fan curve when selecting an ECM.
A person in a space for 10 or more consecutive minutes.
What is an occupant?
Do you need to know this when designing the space?