Montigo HR38DF Installation, Operation & Maintenance Manual page 9

Figure 10. Typical Top Vent installation. If the 90° elbow is installed
directly on the fireplace, for height to the center of the
termination see chart on page 3.
Horizontal Venting
MEXT Section
PEXT Section
Figure 11. Typical Top Vent installation. The solid sections can be used
in various combinations to obtain the desired vent run. The
vent run must fall within the limits set by the venting graph.
Example 2:
Rigid sections and an elbow used in conjunction with 3 ft. flex section
(MFL-3 / PFL-3) will, when extended in a five foot chase, allow for a
maximum horizontal run of twelve and one-half feet from the centre of
the fireplace to outside wall and a minimum of 7'6" when retracted in
opposite direction (see Figure 12 and 13).
"C" flex sections and "D" rigid sections may be used in conjunction with
one another to obtain different possible horizontal length installations.
NOTE: Flex section with no vertical rise must not exceed maximum
horizontal length of 3 feet (see Figure 14). Flex runs over 3 feet must
fall within the limits set by the venting graph, and must have a minimum
vertical rise of 3" per foot of flex.
Part No. XG0147 - 011410
Installation
RHS8 Heat Shield
PEL
PEL-90F/F Elbow
90° Elbow
Termination
RHS8 Heat
Sheild
Figure 12. Extended Installation using a combination of solid and flex
venting. Use the vent graph to determine your allowable
run, then select appropriate components.
Figure 13. Retracted Installation using a combination of solid and flex
venting. Use the vent graph to determine your allowable
run, then select appropriate components.
Figure 14. Horizontal flex installation with no vertical rise.
H38DF Series Gas Fireplace
RHS8 Heat
Shield
RHS8 Heat
Shield
RHS8 Heat
Shield
Page 9