Chapter 9 vents

why are plumbing traps required to be vented?

• to avoid traps being drained of their liquid seals

• to convey sewer gas to outside air

• to enable drains to drain better

• all of the above

soil and waste stacks in buildings have more than _____ branch intervals shall be provided with relief vent at each _____ intervals installed, beginning with the top floor.

• 5, fifth

• 10, fifth

• 10, tenth

• 10, third

an open vent terminal from a drainage system shall not be located directly beneath any door, openable window, or other air intake opening of the building or of an adjacent building, and any such vent terminal shall not be within ____ feet horizontally of such an opening unless it is ____ feet or more about the top of such opening.

• 8,3

• 10,3

• 8,2

• 10,2

venting systems for a DWV plumbing installation are required to _____

• terminate in open air above the building be served by plubing

• run independently without tying into a common venting design

• terminate in a ventilated attic space or open air space outside of the building be served

• have a minimum pipe diameter of 2 inches

circuit vents may be _______

• connected to stack vents

• connected to vent stacks

• connected to a main vent system that extends to outside air

• A and B only

an island fixture must have a ________ installed to ensure proper ventilation of the fixture.

• foot vent

• relief vent

• a vent connection back to drain

• both A and B are the same.

the vent size shall be not less than __________.

• one-half the diameter of the rough-in drain to served

• 2 inches

• 3 inches

• 1 1/2 inches

in order to eliminate a crown vent, the distance from the weir to the vent opening shall be no less than _______.

• 2 inches

• 4 inches

• two times the diameter of the pipe

• it does not matter anymore with modern plumbing.

a vent stack shall be required for every drainage stack that has _____ branch intervals or more.

• five

• ten

• three

• none of the above

how would you describe a branch vent?

• it is an independent vent

• it is a vent that is used to vent branch drains

• it is a vent that can convey both sewer gas and sanitary drainage

• it is a vent that runs horizontally and provides a connection point for other vents