Fabrication Flashcards
Why are transitional fittings used
Change the ratio
move a duct for architectural reasons
Why are transition fittings avoided
Time
money
What is three joints used to join traditional fittings to each other
Slip and drive
CP connection
propriety connection
What must be done to net pattern for each slip and drive joint connection
Reduce the length of net pattern by 1”
What must be Develop first one developing cheek for a curved runner pattern
The flat view or pattern
The Stretch out lengths for heel runner should be calculated
True
What Mathematical concept is used when building transition from Plainview
Pythagorean theorem
When developing two sided slope transition how do we determine which gets slow pocket allowance
The one with the most amount of slope
On assembling a transition fitting what should be done before assembly
Form seams and edges
Open Pittsburgh lock 
When developing a centred one-way Square to round what is the minimum plan view required
Half pattern on ,centre to Square requires quarter inch plan
How far should your half plan view be drawn from the edge material
At least 1 inch
How do you tell on square to round a inside or outside pattern
If pattern goes ABCD it’s an inside if pattern gose DCBA it’s an outside
To forming an elbow what machine should be used
Rotary elbow machine
What happens when rectangular duct exceeds 4:1
Airflow reduction
What is a standing drive connection
Known as a CP connection requires too allowance to be added to the raw edge
