Plumbing School Year 3 Module 4 Exam |
Atcual Questions and Answers with Verified
Solutions | Latest Updated 2026
Air admittance vent A valve-type vent that ventilates a stack
using air
inside a building. The vent opens when
exposed to
reduced pressure in the vent system, and
it closes
when the pressure is equalized
Back pressure Excess air pressure in vent piping that can
blow
trap seals out through fixtures. Back
pressure can
be caused by the weight of the water
column or by
downdrafts through the stack vent.
Branch interval The space between two branches
connecting with
a main stack. The space between branch
intervals is
usually story height but cannot be less
than 8 feet.
Branch vent A vent that connects fixtures to the vent
stack
,Circuit vent A vent that connects a battery of fixtures to
the
vent stack
Combination waste-and-vent A line that serves as a vent and also
system carries
wastewater. Sovent systems are an
example of a
combination waste-and-vent system
Common vent A vent that is shared by the traps of two
similar
fixtures installed back-to-back at the same
height.
It is also called a unit vent
Continuous vent A vertical continuation of a drain that
ventilates a
fixture
Horizontal vent A vent that runs at an angle no greater
than 44
degrees to the horizontal.
Hydraulic gradient The maximum degree of allowable fall
between a
trap weir and the opening of a vent pipe.
The total
fall should not exceed one pipe diameter
from weir
to opening.
, Indirect or momentum siphonage The drawing of a water seal out of the trap
and into
the waste pipe by lower-than-normal
pressure. It is
the result of discharge into the drain by
another
fixture in the system.
Individual vent A vent that connects a single fixture
directly to the
vent stack
Loop vent A vent that connects a battery of fixtures
with the
stack vent at a point above the waste
stack.
Relief vent A vent that increases circulation between
the drain
and vent stacks, thereby preventing back
pressure
by allowing excess air pressure to escape.
Re-vent To install an individual vent in a fixture
group
Self-siphonage A condition whereby lower-than-normal
pressure
in a drainpipe draws the water seal out of a
fixture
trap and into the drain
Atcual Questions and Answers with Verified
Solutions | Latest Updated 2026
Air admittance vent A valve-type vent that ventilates a stack
using air
inside a building. The vent opens when
exposed to
reduced pressure in the vent system, and
it closes
when the pressure is equalized
Back pressure Excess air pressure in vent piping that can
blow
trap seals out through fixtures. Back
pressure can
be caused by the weight of the water
column or by
downdrafts through the stack vent.
Branch interval The space between two branches
connecting with
a main stack. The space between branch
intervals is
usually story height but cannot be less
than 8 feet.
Branch vent A vent that connects fixtures to the vent
stack
,Circuit vent A vent that connects a battery of fixtures to
the
vent stack
Combination waste-and-vent A line that serves as a vent and also
system carries
wastewater. Sovent systems are an
example of a
combination waste-and-vent system
Common vent A vent that is shared by the traps of two
similar
fixtures installed back-to-back at the same
height.
It is also called a unit vent
Continuous vent A vertical continuation of a drain that
ventilates a
fixture
Horizontal vent A vent that runs at an angle no greater
than 44
degrees to the horizontal.
Hydraulic gradient The maximum degree of allowable fall
between a
trap weir and the opening of a vent pipe.
The total
fall should not exceed one pipe diameter
from weir
to opening.
, Indirect or momentum siphonage The drawing of a water seal out of the trap
and into
the waste pipe by lower-than-normal
pressure. It is
the result of discharge into the drain by
another
fixture in the system.
Individual vent A vent that connects a single fixture
directly to the
vent stack
Loop vent A vent that connects a battery of fixtures
with the
stack vent at a point above the waste
stack.
Relief vent A vent that increases circulation between
the drain
and vent stacks, thereby preventing back
pressure
by allowing excess air pressure to escape.
Re-vent To install an individual vent in a fixture
group
Self-siphonage A condition whereby lower-than-normal
pressure
in a drainpipe draws the water seal out of a
fixture
trap and into the drain
