Circuit Vent Flashcards
How many fixtures may be served by a single circuit vent?
9
Where is the circuit vent connection made to the circuit vented branch
Downstream of the highest connected circuit vented fixture
When is a relief event required?
Every circuit vented branch must be relief vented in some manner
How many fixed units may be discharged into a relief vent
6 fixture units
How many fixtures may be discharged in into an additional circuit vent and what is the maximum fixture unit load per fixture?
2 fixtures, 1 1/2 fixture units per fixture 
Is it permitted, to discharge a fixture from a higher floor level into a circuit vented branch?
No
How many relief vents would be required if you were to have two circumvented branches that connect to a common branch
2
What is the minimum size of a circuit vent branch that serves fixtures with 2 inch traps?
3”
What is the minimum size of an additional circuit or relief vent?
One size smaller than the circuit vent, but need not be larger than two
How many circuit vents would be required for branch serving 15 water closets?
1
When circuit vents, additional circuit vent and relief vent have fixtures, discharging into them, how are the sized downstream of the fixture connections?
As a wet vent
What is the minimum size of the circuit vented branch that serves fixtures with traps smaller than 2 inch?
2 inch
When are additional circumvent required?
When there are more than eight circuit vented fixtures between the circuit vent and the relief vent, and when there is a horizontal change in direction of more than 45°
The fixture unit load of separately rented fixtures that connect to the circuit. Vented branch are taking into consideration when sizing the circuit vented branch.
True
Which of the following is not used to size the circuit vent?
Fixture unit load of fixtures connected to the relief
