77Installing a Common Vent System
WARNING
ALWAYS ensure your work area is well ventilated
or wear an approved organic vapor respirator
when working with primers and solvent
cements to prevent serious injury or death.
The vapors from primers and solvent cements
can cause nausea and other health effects,
including death.
To connect the vent pipes using cement:
1. Spread an even layer of solvent cement on the
inside of the pipe fitting and the outside of the
pipe.
2. Align the pipe with the pipe fitting and twist
the pipe a quarter turn as you insert it into the
fitting. Twisting the pipe spreads the solvent
cement evenly to ensure a solid joint.
3. Hold the pipe and pipe fitting together for
about 15 seconds until the cement sets.
Note
●
Use approved solvent type cement
for the proper vent materials.
●
Use solvent type cement only.
●
Check the date of manufacture
before using the cement. Ensure that
cement was not manufactured more
than 2 years prior to using it.
●
Ensure that the inside of the pipe
fitting and the outside of the pipe,
where cement will be applied, is
clean.
●
Apply an even layer of cement over
all mating surfaces.
●
Use solvent cement in room
temperatures higher than 32℉ (0℃).
●
Use primer when required especially
if temperature is below 32°F (0°C).
●
Installing vent pipe with cement
in cold ambient temperatures can
result in longer cure times.
WARNING
Carbon Monoxide Hazard
To prevent serious injury or death:
●
NEVER apply force or impact to pipes after
making connections.
●
Excessive force might cause the pipe or fitting
to leak harmful gas.
6.1.2 Determining the Length of a
Common Vent System
Follow the instructions listed below to determine
the length of a common vent.
1. Add the BTU/H input ratings for each unit in the
cascading system to determine the total BTU/H
rating.
2. Determine the total length (L) of the common
vent, which consists of the horizontal width (W)
and the vertical height (H): Total length (L) = W
+ H.
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