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A ProVent Base Fitting must be
installed at the base of each vertical stack before it enters the
horizontal building drain. If the vertical distance to the closest
ProVent Stack Fitting exceeds twenty feet (20’-0") an inline offset
must be installed within five feet (5’-0") above the ProVent Base
Fitting. The building drain size is calculated by using
Chart 4 in
accordance with the fixture unit values (D.F.U.) for all fixtures
discharging into it as shown in
Chart 1. |
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The ProVent Base Fitting has
a pressure relief vent opening that extends up then returns
down 180 degrees using pipe and fittings that connect to the
horizontal building drain at a point no less than 10 pipe
diameters downstream from the center line of the vertical
stack to the centerline of the branch wye. The pressure
relief vent line may run parallel to the horizontal drain
and must connect above the centerline of the drain. Branch
soil or wastes are allowed when they are connected above the
horizontal drain line. They cannot connect in-between any
short pipe areas where there is a change in direction from
the Base Fitting downstream to the building drain. |
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The ProVent Base Fitting has
a pressure relief vent opening that extends up then returns
down 180 degrees using pipe and fittings that connect to the
horizontal building drain at a point no less than 10 pipe
diameters downstream from the center line of the vertical
stack to the centerline of the branch wye. The pressure
relief vent line may run parallel to the horizontal drain
and must connect above the centerline of the drain. Branch
soil or wastes are allowed when they are connected above the
horizontal drain line. They cannot connect in-between any
short pipe areas where there is a change in direction from
the Base Fitting downstream to the building drain. |
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The ProVent Base Fitting has
a pressure relief vent opening that extends up then returns
down 180 degrees using pipe and fittings that connect to the
horizontal building drain at a point no less than 10 pipe
diameters downstream from the center line of the vertical
stack to the centerline of the branch wye. The pressure
relief vent line may run parallel to the horizontal drain
and must connect above the centerline of the drain. Branch
soil or wastes are allowed when they are connected above the
horizontal drain line. They cannot connect in-between any
short pipe areas where there is a change in direction from
the Base Fitting downstream to the building drain. |
The ProVent Base Fitting has a
pressure relief vent opening that extends up then makes a 180 degree
turn downward using pipe and fittings that connect to the horizontal
building drain at a point no less than 10 pipe diameters downstream
from the center line of the vertical stack to the centerline of the
branch wye. The pressure relief vent line may run parallel to the
horizontal drain and must connect above the centerline of the
drain. Branch soil or wastes are allowed when they are connected
above the horizontal drain line. |
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A ProVent Base Fitting must be used
on any stack offsets of more than 60 degrees with the pressure
relief vent connection running from the base fitting back into the
top vertical portion of the stack drop. |
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Soil and waste branches can be
connected into the building drain between the stack and the relief
vent when the connections are made above the center line of the
building drain. The branch fixture unit loading should be in
accordance with the pitch of the pipe as shown in
Chart 3. |
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Waste branches at least (1) one pipe size smaller can
be connected to the pressure relief horizontal vent line. Washing
machine drains should not connect to the pressure relief vent line. |
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Soil or waste branches may connect
directly into the vertical stack directly below the ProVent Base
Fitting only when the connections are made using fittings such as a
combination wye and 1/8 bend or a ProVent Stack Fitting. |
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Conventional waste & vent plumbing
systems can connect downstream from the pressure relief vent to pick
up remote fixtures. Conventional revents can tie back into the
ProVent vertical stack with vent sizing based on the additional
fixture units vented or can be separately vented through the roof in
accordance with locally accepted plumbing code vent sizing. |
