MHSC CDVR33 - Page 28

28 69D0023
CDV Series Gas Fireplace
FLEX VENT INSTALLATION
C. Routing UL1777 ex pipe.
1. Always maintain the required clearance when routing the ex vent assembly.
2. Install restop spacers, Figure 37, when penetrating ceiling, attic spaces, or walls.
3. Do not allow the exible vent to bend in radius tighter than 5" (127 mm). Figure 36
4. Horizontal runs of exible vent shall be supported at maximum two (2) foot intervals; vertical runs, ve (5)
foot intervals. Metal strapping, properly secured, is an acceptable means to support the exible vent.
5. Flexible vent spacers are to be installed at intervals prescribed by the exible vent manufacturer; and in such
a way as to maintain concentric inner and outer vent spacing.
D. Attaching exible venting to vertical termination assemblies.
1. When using Simpson pipe, an MHSC ex-to-pipe adapter (FPA) and/or rigid pipe section(s) is required
to connect the exible vent assembly to the vertical termination by using three (3) self-penetrating
screws.
2. Review Figure 38 and corresponding instructions for proper overlap, clamp and screw placement.
3. Three (3) each self-penetrating screws are drilled opposite one another and below the gear clamp.
4. Use only listed and approved terminations and accessories, installed per the installation instructions
and Figure 37.
E. Installing exible venting to horizontal termination assemblies.
1. Connect the 4" exible vent to the horizontal termination as in Figure 39.
2. Slide termination cap adapter ring over the termination cap's outside pipe and secure with three (3)
screws.
3. Connect the 7" exible vent to the termination ring as in Figure 39.
4. Review Figure 39 for proper overlap and clamp placement.
5. Three (3) each self-penetrating screws are drilled opposite one another and below the gear lamp.
6. Use only listed and approved terminations and accessories, installed per the termination instructions
and Figure 39.
Termination Cap
Storm Collar
Roof
Support
Flashing
Rigid Length
Pipe
Flex to Pipe
Adapter
(FPA/8)
Firestop
UL1777
Flex Pipe
DVFA/8
Adapter
FP1974
Figure 37 -
Typical Vertical Flex Vent Installation
FP1975
pipe connection
Screws (3
Places equi-
distant just
above gear
clamp)
Rigid Pipe
Length
Flex to Pipe
Adapter (FPA/8)
Gear Clamp
1
3
/4" Flexible Pipe
and Adapter Outer
Collar Overlap
UL1777 Flex
Vent
Gear Clamp
FP1975
Figure 38 -
Typical Pipe Connection
Fp2044
flex vent termination
MHSC
Horizontal
Termina-
tion
1
3
/4" Flexible Pipe
and Adapter Outer
Collar Overlap
Gear
Clamp
UL1777
Flex Vent
Screws (3 Places
equidistant just
above gera clamp)
Gear Clamp
Figure 39 -
Typical Horizontal Flex Vent Installation