Duct Takeoffs (110102g) Flashcards
1
Q
When is a duct takeoff used?
A
- When it is necessary to split the main trunk to move a large volume of air to a different zone.
- In place of a y branch
- When there is a change in size of both dimensions of duct
- Field installation in whatever location is needed
2
Q
What are the 2 types of duct takeoffs?
A
Ogee
Straight line
3
Q
What is the max angle the bottom of a pto should form?
A
45 degree
4
Q
Are both wrappers the same length on a pto?
A
No
5
Q
What are the common duct connections used on residential ptos?
A
Slip and drive and hammerlock
6
Q
What is the allowance for the male hook for a Pittsburgh on a sweep takeoff?
A
3/16
7
Q
What is the allowance for a 3/4 hammerlock?
A
2 1/4
8
Q
What is the brake sequence for a hammerlock if you are looking at an inside pattern?
A
Down
Up
Down
