9
REAR VENT HORIZONTAL TERMINATION
When venting off the rear of the unit and terminating horizontally, a #45 natural gas orifice or a #55 propane orifice must be used.
FIGURE 14a
The maximum allowable length is 20 feet. All 90° and 45° elbows (except the first two when venting horizontally) re- duce the length by 5 feet each, both horizontally and verti- cally). In this illustration, the maximum allowable length after taking the two elbows into account is 10 feet.
R E Q U I R E D
V E R T I C A L
R I S E F R O M
F I R E P L A C E
TO FIRST EL-
B O W I N
INCHES
FIGURE 14b
CALCULATED HORIZONTAL VENT RUN IN FEET
Care should be taken not to damage the gas pipe. When removing the orifice, using a 9/16" socket wrench, a 7/8"
CHANGING A TOP VENT TO A REAR VENT
STOVE TOP
TOP VENT FILLER PLATE
7" COVER
Unscrew and discard the top vent filler plate. Lift off the cast stove top. Unscrew the four screws holding both the top heat shield and the 7" flue collar in place and lift off.
FIGURE 17b
Lift the gasket off. Unscrew the 4 screws securing the 4" collar and its gasket in place and remove it and the knock- out from the rear panel. Remove the 7" and 4" covers and gaskets from the back. Position the 4" gasket and cover over the flue opening in the top.
Use the chart on this page to calculate horizontal runs for vertical rises between 29 and 57 inches.
When calculating maximum run lengths, include 5 feet for each 90° or 45° elbow.
(DO NOT INCLUDE THE FIRST TWO ELBOWS DIRECTLY OFF THE UNIT WHEN VENTING HORIZONTALLY.)
ORIFICE REPLACEMENT
4" COVER
FIGURE 17c | (FLANGE DOWN) |
Secure with 4 screws. Place the 7" gasket and cover over the air opening in the top. Replace the top heat shield and
TOP HEAT SHIELD
FIGURE 15 | FIGURE 17d |
In order to access the orifice, the log support secured by two screws, must be removed.
FIGURE 16 | |
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