Mech & Plumb Systems (IDPX/PRAC) Flashcards
(37 cards)
Example of a VAV System
What is the minimum cubic feet per minute per person required to maintain proper Indoor Air Quality?
5 CFM per person
What are Grilles?
They REMOVE air from an indoor space adn return it to the HVAC system for reconditioning
What are Registers?
SUPPLY conditioned air into an indoor environment
What are Diffusers?
PUSH conditioned air into a space in a set pattern for optimal airflow
Where is a plenum located?
Between the ceiling and the structural floor above
All supply air is connected to what?
Main duct work
When fire partitions ar presented what must be provided?
Supply air ducts and openings for return air
What is a mixing box?
Adjust the quanity or temperature of air going into a space from the main supply lines
What are thermostats connected to?
Mixing box
VAV boxes are typically placed where?
Above the ceiling within or near the space it serves
Daylight sun pattern example
Where do ducts run?
Plenum or chase
When a duct passes through a fire rated wall or other assembly it must have what?
Fire stop
Most HVAC systems use what for air return?
Duct or plenum
What can be used in a fire area for air return a duct or plenum?
Plenum
Can a plenum go trhough a stair shaft/well?
NO
Access panels must be install in what kind of ceilings?
Gyp
Do you need an access panel in a suspended ceiling?
NO since it allows for easy access
What does AHU stand for?
Air Handling Units
Where should thermostats be located?
- Away from exterior walls
- Away from heat sources and enclosed rooms
How high are thermostates installed?
44” to 48”
How far away from the inside of glass should air supply (vents) be located?
2”
Ducts are noted with two numbers, 10x8, what is the first number and what is the second number represent?
Width and Height
10W x 8H
