(Extra) Air Extractors, Fire Dampers, and Layout of Elbows

Question 1

What is used to extract air from the main duct into the branch ducts when there is not adequate room to mount a splitter?

Answer 1

Air extractors

Question 2

What are 3 important functions for multi-blade dampers?

Answer 2

To control and mix outside air with return air, to bybass heat transfer equipment, and to control air quantities handled by the fan.

Question 3

Multi-blade dampers come as either ___ or ___ bade.

Answer 3

Parallel or opposed blade

Question 4

Parallel blade dampers are used when a system requires which two positions?

Answer 4

Fully open or fully closed operation

Question 5

Parallel blades should not bed used for volume control? True or False?

Answer 5

True due to uneven airflow

Question 6

When are opposed blade dampers used?

Answer 6

When volume control is required

Question 7

On opposed blade dampers, where should the actuators always be hooked up by?

Answer 7

A blade that a low bracket is mounted to

Question 8

How many patterns do you need to make an elbow?

Answer 8

One

Question 9

How many patterns do you need to make a round offset?

Answer 9

One

Question 10

What is the mitre rise formula?

Answer 10

# of degrees
\_\_\_\_\_\_\_\_\_\_\_\_\_\_
# of pieces x 2 - 2