Cutting takeoffs and proper attachment to trunklines (Mechanical Training # 104)

Test questions below!
Common tools used are linked in the description below;

Video Chapters
0:00 Intro
0:18 Tools used
0:50 How to use a Malco hole cutter
4:23 Assembly line process
6:19 The do's and don'ts of takeoff placement
9:48 Cutting takeoffs with snips
15:25 Installation of takeoff on insulated duct
18:11 Flex duct connection notes
19:17 Working with flex duct and measuring tricks
22:38 Flex connection to a boot
27:12 Flex connection to trunkline
29:02 AGL Mechaincal Tips Exclusive Tip
29:58 Flex connection to trunkline
33:45 More on Panduit straps
35:28 Proper mastic application
36:05 Closing

Tools used;
Wiss Scissors
https://amzn.to/3HKBKP5

Bostitch Staple Gun
https://amzn.to/3V8xCLN

Malco Hole Cutter
https://amzn.to/3FzAUBP

Red snips (Midwest offset were used in video)
https://amzn.to/3V99mZI

Duct tape used
https://amzn.to/3PD7441

Mastic tape used
https://amzn.to/3HHVAdx

Impact drill
Speed drill
Razor knife
Sharpie
Dykes

Duct tape used
https://amzn.to/3PD7441
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Cutting takeoffs and proper attachment to trunklines (Mechanical Training # 104)
1. When setting your hole cuter size you should;
A. set it for the exact size hole you are cutting
B. set it about a ¼” larger than the size you want to cut so that you have room for error when setting your takeoff
C. adjust the speed setting on your hole cutter
D. all of the above
2. When using your hole cutter you should;
A: cut in a clockwise rotation
B. slightly angle your hole cutter so that it cuts faster
C. pull back on the hole cutter towards the end of the cut so that the material doesn’t collapse.
D. all of the above
3. Whenever possible before starting takeoffs you should;
A. route all of your supply runs to the trunkline
B. mark your takeoff and then strap your run to the takeoff
C. mastic the trunkline
D. all of the above
4. When cutting takeoffs you should;
A. start and finish installing each takeoff individually
B. if possible mark all takeoffs at once, then cut all takeoffs at once, then install all takeoffs at once
C. carry all your tools with you while cutting takeoffs
D. all of the above
5. When installing takeoffs in a crawlspace the runs should be;
A. perfectly level
B. cut takeoffs towards the top of the trunkline and add an elbow to keep the runs high
C. cut the takeoff at a slight angle and angle then run upwards to allow more room for crawling
D. cut the takeoff towards the bottom of the trunkline to allow room to crawl over
6. When marking takeoffs avoid placing takeoffs;
A. closer than 12” of the endcap
B. on a transition
C. on an elbow
D. all of the above
7. When marking takoffs, takeoffs should be;
A. at least 6” apart if not more
B. staggered from each other and not directly across
C. on the correct size duct outlined on the plans
D. all of the above
8. After setting a takeoff you should inspect and confirm that
A. there is no material obstructing the opening
B. that the radius of the takeoff aligns well with the duct
C. there is a good seal around the takeoff, mastic tape if necessary
D. all of the above
9. When working with flex duct it is important to
A. stretch the flex out after opening the box
B. keep your ends tucked when working with flex
C. immediately strap flex that it is hanging off a boot or fitting
D. all of the above
10. When planning runs out each run should have
A. a strap every 8’
B. downward slope for proper air flow
C. at least 4-6 feet of flex with two 90 degree turns to avoid excessive noise and airflow
D. all of the above
11. Before hanging boots they should;
A. always have flex attached
B. have mastic applied if application allows
C. have boot clips or plaster flanges if needed
D. all of the above
12. Flex runs should be routed and strapped to the trunkline prior to cutting takeoffs. When doing this it is important to consider;
A. planning the most efficient route to the takeoff while considering attic access
B. strapping every 4’ and avoiding any sagging
C. strapping properly to avoid a kink at the boot
D. all of the above
13. When determining where to cut flex for trunkline attachment it is important to
A. cut flex about 6”-8” longer to allow for connection loss, adjust if cut too long
B. cut flex exact length to takeoff
C. allow plenty of extra flex so that there is plenty for a connection even if the run ends up being too long
D. cut flex short and add splice later
14. When making a flex connection to the trunkline you should
A. tuck the end of your flex duct so that the insulation is doubled up
B. gently tighten the flex with a double piece of duct tape
C. use double pieces of duct tape about 5” long, rounding them while sticking them in place
D. all of the above
15. When applying mastic to a takeoff you should
A. only mastic tape seems
B. solid mastic a clean circle around the takeoff
C. mastic before you tape
D. all of the above