Chapter 9 Vents

Question 1

The main purpose of venting is for _____.

Answer 1

trap seal protection

901.2

Question 2

The vent system is necessary to prevent pneumatic pressure differentials of more than _______ against the trap seal of any fixture.

Answer 2

1” of water column

901.2

Question 3

The vent system of a chemical or acid waste system must be____________.

Answer 3

independent of the sanitary vent system

901.3

Question 4

Field fabricated lead flashings shall weigh not less than _____ pounds per square foot.

Answer 4

3 Pounds per square foot

902.3

Question 5

What is the minimum number of vent terminals that are required to extend to the atmosphere?

Answer 5

One

904.1

Question 6

A vent stack connection to the base of a stack is required to connect________.

Answer 6

At or below the lowest horizontal branch

904.4

Question 7

Where required to be protected against frost closure, the vent extension through the roof shall be not less than ___inches in diameter beginning not less than___ inches below the roof.

Answer 7

3 inches & 12 inches

903.2

Question 8

What is the minimum required height of a vent terminal located on a roof that is used for purposes besides weather protection.

Answer 8

7 feet

903.1

Question 9

A vent shall terminate a minimum of ___feet horizontally from or at least __feet above a window opening.

Answer 9

10 feet & 3 feet

903.5

Question 10

What is the minimum required height above grade for a vent terminating through the side wall of a building.

Answer 10

10 feet

903.6

Question 11

A dry vent is prohibited from offsetting horizontally until the vertical rise of the vent is _____.

Answer 11

6 inches above the flood level rim of the highest fixture being vented. 905.4

Question 12

A kitchen sink with a 1 1/2-inch fixture drain must be vented within a developed length of __ feet from the trap weir to the vent fitting.

Answer 12

6 feet

Table 909.1

Question 13

Which fixture is allowed to have a vent connection to the fixture drain below the trap weir?

Answer 13

water closet

909.2

Question 14

In no case shall the diameter of a stack vent and vent stack be less than one-half the diameter of the drain served or less than ___ inches.

Answer 14

1 1/4 inch

906.1

Question 15

Vents exceeding ___ feet in developed length shall be increased by one nominal size for the entire developed length of the vent pipe.

Answer 15

40 feet

906.2

Question 16

Every building in which plumbing is installed shall have at least one dry vent that extends to the____.

Answer 16

Outdoors

904.01

Question 17

The minimum height a sanitary sewer vent shall terminate above a roof is ____.

Answer 17

6 inches

903.1 GA Amendment

Question 18

Vent stacks shall connected at or below the lowest horizontal branch and where the vent stack connects shall be located downstream of the drainage stack and _______________.

Answer 18

within a distance of ten times the diameter of the building drain.
904.4

Question 19

The maximum distance a 3” trap shall be located from its vent is______.

Answer 19

12 feet

Table 909.1

Question 20

When two fixtures are common vent and connected at different levels, the upper fixture cannot be a _____.

Answer 20

Water Closet

911.3

Question 21

Sheet copper used for flashing material must be a minimum weight of______.

Answer 21

8 ounces per square feet

902.2

Question 22

All vent piping must be sloped such that all moisture will be drained to the drainage system by _________.

Answer 22

Gravity

905.2

Question 23

When a dry vent is connected to a drain line it shall be connected ________.

Answer 23

Above the center line of the horizontal drain pipe

905.3

Question 24

A connection between a vent and a vent stack or stack vent must be made a minimum of ___ inches above the flood level rim of the highest fixture served by the vent

Answer 24

6 inches

905.5

Question 25

A 4-inch trap can be located a maximum of ______ from a vent.

Answer 25

``` 16 feet (48 x 4" = 192") Table 909.1 ```

Question 26

The maximum distance a 3" trap shall be located from its vent is_____.

Answer 26

``` 12 feet( 48 x 3" = 144") Table 909.1 ```

Question 27

A vent installed within less than two pipe diameters of its trap would be a code violation and would be referred to as a___.

Answer 27

Crown vent | 909.3

Question 28

A common vent can serve ___ fixture(s) located on the same floor level.

Answer 28

Two | 911.1

Question 29

A wet vent may serve _________.

Answer 29

Any combination of fixture within two bathroom groups located on the same floor level 912.1

Question 30

The dry vent for a horizontal wet vent system cannot be connected to the _____.

Answer 30

Emergency floor drain | 912.2.1

Question 31

Each wet-vented fixture drain shall connect _______ to the horizontal wet vent.

Answer 31

Independently | 912.1

Question 32

A waste stack that is part of a waste stack vent system shall be installed vertically with every fixture drain connected _______.

Answer 32

Separately | 913.2

Question 33

Which fixtures can connected to a waste stack vent system?

Answer 33

Floor drains , mop sinks , drinking fountains & lavatories 913.2

Question 34

The stack vent for a waste stack vent system shall not be less than_____.

Answer 34

The size of the stack it is connected to | 913.3

Question 35

A circuit vent may protect a maximum of__ fixture traps with their fixture drains connected to a horizontal branch drain.

Answer 35

Eight | 914.1

Question 36

Where is the circuit connected to the horizontal branch?

Answer 36

Between the two most upstream fixture drains connected to the horizontal drain 914.2

Question 37

A horizontal combination waste & vent is to be installed in the kitchen of a restaurant.The horizontal main waste pipe is 6”. The minimum size of the downstream vent must be no less than ____”.

Answer 37

3” | 915.2.4

Question 38

What is the minimum size required for a stack vent serving a 2 1/2" waste stack?

Answer 38

2 1/2" | 913.3

Question 39

A relief vent is required when a circuit vented branch receives the discharge of how many water closets & it connects to a stack receiving discharge from above?

Answer 39

4 or more | 914.4

Question 40

A circuit vent is prohibited from receiving any discharge, but a relief vent is permitted to be a fixture drain when the discharge is not more than _________.

Answer 40

4 DFU's | 914.4.2

Question 41

The maximum slope of a horizontal combo waste & vent pipe ?

Answer 41

1/2" per foot | 915.2.1

Question 42

Where does the vent of an individually vented fixture connect to ?

Answer 42

fixture drain of the trapped fixture | 910.1

Question 43

Where two fixtures connect at different levels of a vertical drain pipe, the common vent is sized based on what?

Answer 43

max discharge of the upper fixture drain | 911.3 & Table 911.3

Question 44

Where do you connect fixture not in a bathroom group to the horizontal wet vent that serves the bathroom group?

Answer 44

downstream of the horizontal wet vent | 912.1

Question 45

In a horizontal wet vent system, how many wet vented fixture drains are allowed to discharge upstream of the dry vent connection?

Answer 45

1 | 912.2.1

Question 46

What is the maximum number of branch intervals that an air admittance may serve as the vent stack terminal?

Answer 46

6 | 918.3.2

Question 47

The minimum number of inch an air admittance valve most be above insulation materials?

Answer 47

6" | 918.4

Question 48

If a waste stack has more than 10 branch intervals,the relief vent will be sized in accordance with what?

Answer 48

the vent stack serving the waste stack | 908.2

Question 49

Which of these systems would you use on the bathrooms for a multistory hotel, single stack vent or a waste stack vent?

Answer 49

Single stack vent | 913.2 & 917.2

Question 50

Which vent system allows the vent to be offset below the fixture drain served by the system.

Answer 50

Island fixture vent | 916.2