Flat Rectangular AandB+ Roof Jacks Flashcards

1
Q

The circumference rule is flexible and can be used as a guide for __________ curves.

A

Irregular curves

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2
Q

What is commonly used as a right angle or straight edge in a shop?

A

Framing square

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3
Q

What are protractors used for?

A

To measure and develop various angles

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4
Q

What is preferred to use for marking break lines and cut lines on metal

A

Felt markers

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5
Q

What helps save material and time during fitting fabrication

A

A Cut list

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6
Q

Growth allowance for fittings is typically removed by _________inch per joint

A

1/16”th

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7
Q

What is used to scribe lines parallel to the edge of a sheet of metal?

A

The Marking Gauge

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8
Q

What is used to scribe arcs larger than you can with dividers?

A

Trammel points out that

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9
Q

Before you develop a pattern, ensure the material is:

A

Cut to size and square

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10
Q

Flat rectangular fittings typically consist of:

A

Cheeks and wrappers/runners

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11
Q

Adjusting the __________ pressure ensures the material is clamped firmly but not deformed

A

Clamp pressure

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12
Q

What is used to form allowances on curved cheeks of light gauged metal?

A

A Power flanger

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13
Q

Cross-breaking is done to add ______ to large flat surfaces of metal

A

Stiffness

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14
Q

Converging angles and allowances must often be formed by what with pliers?

A

By Hand

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15
Q

What does a standing drive joint provide?

A

Provides additional rigidity to the duct

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16
Q

What duct connection simplifies fitting assembly and provides more rigidity?

A

A proprietary duct connection

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17
Q

What is used to open S cleats before installing them

A

Screw driver

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18
Q

Tacking a seam means:

A

Folding down the flange in intervals so it doesn’t come apart

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19
Q

Properly finished seam shows what about the fabricator?

A

Professionalism

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20
Q

The assembly of what fitting begins at the crotch for proper alignment

A

The Y-Branch fitting

21
Q

What does the Box-Pan break have that can be adjusted for forming one piece pans?

A

Adjustable Fingers

22
Q

To avoid stretching material, fold the flanges in ____

A

Stages when using a hammer

23
Q

What machine is used to roll curved runners for duct fittings?

A

Roll forming machine

24
Q

The corners of proprietary duct connections are joined with what?

A

Bolts or Special Clips

25
Q

What is used to isolate HVAC equipment from ductwork?

A

Flexible duct connection

26
Q

What do you do if no specifications are given for installing flexible connections?

A

SMACNA offers guidelines to help

27
Q

Stretch out of the material for round flex connector is:

A

Net pattern stretchout plus 1inch on either side

28
Q

Fire dampers must be ____ rated and cannot be ___

A

ULC, Modified

29
Q

Min and Max a Fire damper sleeve must extend out of the fire wall

A

3” min and 6” Max

30
Q

Gauge of metal to be used for a fire damper sleeve is based on the size of the duct and whether the sleeve is made as a what?

A

Rigid type or has break away connections

31
Q

The type of breakaway connection is usually set where?

A

In the Job Specifications

32
Q

The type of longitudinal seam is most often what?

A

The same as the ductwork that the fire damper sleeve connects too

33
Q

Roof jacks are commonly used when:

A

They need to penetrate the roof membrane

34
Q

Cylindrical roof jacks are pieces of what?

A

Round pipe

35
Q

The 2 most common seams to fasten a round body to a flashing plate are:

A

Hammerlock or the elbow seam

36
Q

Conical roof jacks require a different what?

A

Pattern development

37
Q

Rectangular roof jack bodies are seamed at:

38
Q

Seam locations on sloped roof should avoid:

A

The up slope part of the jack

39
Q

Edge at the bottom of the jack is to do what?

A

Stiffen them

40
Q

First period sealing will be done with what?

41
Q

The hole in the flashing plate for a sloped jack will be:

A

Elliptical

42
Q

Conical cap shape is

43
Q

The support legs should be mounted ____ to the cap

A

Perpendicular

44
Q

Support legs need tabs that bend at what angle towards the peak of the cap?

A

90 degrees

45
Q

Minimum edge distance for mechanical fasteners is what?

A

2 times the fastener diameter

46
Q

Lap seam allowance must be notched with a ___ of angle notch?

47
Q

The body requires how many fasteners to keep the cap from twisting?

A

Two fasteners

48
Q

Roof jack body seam should be sealed how much of its length?

A

2 thirds of its length