Slant/Fin LX-150 - Manual (Page 17)

Lynx 17
B. DIRECT VENT - VENTING AND AIR INTAKE
THROUGH A ROOF
Figure 14 shows typical vertical venting. The vent pipe must
pass through the ceiling, floor and the roof vertically through a
6” minimum diameter cutout. A fire stop is required for each
ceiling and floor penetration. For roof passage an appropriate
UL listed roof flashing must be used.
The vertical vent piping must terminate with a screened
straight termination. The air intake termination should be a
screened 180˚ elbow facing down. The air intake opening must
be at least 1 foot below the vent opening.
For PVC/CPVC pipe, follow the proper assembly practices
specified on page 8, and venting system restrictions specified
on page 8 of this manual. For stainless steel venting systems,
follow the vent manufacturer’s instructions and the restrictions
specified on page 8 of this manual.
Alternate air intake for venting through a roof (see fig. 14) or uti-
lizing an existing chimney as a chase (see fig. 10): Air intake
may be piped to the boiler from the sidewall as shown on
figure 14a.
DIRECT VENT, VENTING AND AIR INTAKE
THROUGH A ROOF
All joints must be liquid and pressure tight. Use 3” dia. PVC/CPVC schedule 40 pipe, 3” nominal polypropylene pipe or
U/L listed single wall 3" dia. AL29-4C S.S.*. venting materials (See page 7).
* AL 29-4C IS A REGISTERED TRADEMARK OF ALLEGHENY LUDLUM CORP.
** Definition of Snow Line: Knowledge of local conditions will reveal the maximum height that repeated snowfalls accumulate to.
The height should be used as the SNOW LINE.
,
POLYPROPYLENE
Figure 14. Direct vent, venting and air intake through a roof. Figure 14a. Direct vent, venting through a roof and air
intake sidewalls.