LAARS EDN Series - Installation, Operation and Maintenance Instructions - Manual (Page 9)

Endurance Page 9
The vertical vent terminal must be placed such
that the bottom of the vent cap is at least 2-feet (0.6m)
above any structure (such as the peak of a roof or
adjacent wall) within 10 feet (3.0m), and must be at
least 3 feet (0.9m) above where the vent pipe exits the
roof (see Figure 12).
When vertical vent systems have horizontal
components, they must have a condensate drip tee
in the offset. All horizontal portions of the vent
system must slope a minimum 1/4" per foot toward
the condensate drip tee. Laars vertical vent kit and
individual venting components have condensate tees
that work in a vertical vent system, and therefore it
is not necessary to have an offset in a vertical vent
system that uses these parts.
2.2 Stainless Steel Single Pipe Horizontal
and Vertical Vents – Category IV
Stainless steel special gas vent listed to U.L.
Standard 1738 and U.L.C. Standard 636 must be used
to vent all models. Three-inch or 4-inch material can
be used. Vent pipe and fittings are manufactured to
these standards by HeatFab, Inc. under the trade name
of Saf-T Vent ® , by Z-Flex ™ under the trade name of
Z-Vent ® , and by ProTech Systems, Inc. under the
trade name FasNSeal ® . Follow the special gas vent
manufacturer’s instructions regarding design, location
and assembly of the vent system.
The appliance may be vented with any number
of elbows or fittings, providing that the maximum
equivalent feet of venting is not exceeded. Equivalent
feet of vent material is shown in table 2, along with
information about vent temperature and pressure.
Elbows (90°) in the vent system shall be considered to
be 5 equivalent feet (1.5m).
A horizontal vent system must pitch downward,
toward the terminal and away from the Endurance,
as shown in Figure 11. It must pitch at least 1/4"
Figure 10. Multiple Concentric Vent Clearances.
Figure 9. Clearance from Overhang.
Figure 11. Vent System Pitch.
Figure 12. Vertical Vent Terminal Placement.
provided that they are at least 18" (46cm) apart,
centerline to centerline (see Figure 10).
A horizontal vent system must pitch downward,
toward the terminal and away from the Endurance,
as shown in Figure 11. It must pitch at least 1/4"
per foot (21mm per meter). Be sure to take this
into consideration when choosing the vent terminal
location.