Rear Wall Vent Installation-Flex Vent Pipe; Top Vent Side Wall Application - Vermont Castings 33CFDVNV Installation And Operating Instructions Manual

VENTING INSTALLATION
Finish Wall
Firestop
Figure 31 –
Side View of Final Unit Location
REAR WALL VENT INSTALLATIONS –
FLEX VENT PIPE
Follow Steps 1 and 2 on Page 20.
Step 3
Install the 4" (102 mm) flex vent pipe to the appliance col-
lars described in the General Information Assembling Vent
Pipes section of this manual. If the installation requires a
45° angle, grasp the vent pipe close to the appliance collar
and bend to 45°. DO NOT exceed 45°. Figure 32
Install the 7" vent pipe in the same manner as Step 2.
NOTE: There must be a
mm) length of flex vent. Figure 33
Step 4
Assemble the flex vent to the collars on the termination as
you did on the appliance.
Termination
Firestop
Flex section
Appliance collars
Figure 32 –
Grasp the vent pipe close to the collar and end to 45°
angle. Do not exceed 45°.
20306739
FP1473
corner ex install
Vent
Termination
FP2294
• • ••• •••••••
••• • •• •• • •• • •• ••• • •••• • •• •••••••••••••••••••••••••••
•• •• • • • •••• • • • • • • • • • • • • • • •
⁄ " (13 mm) rise in a 12" (305
1
2
FP1473
Figure 33 –
There must be a 1/2" rise per foot length

TOP VENT SIDE WALL APPLICATION

Since it is very important that the venting system
maintain its balance between the combustion air in-
take and the flue gas exhaust, certain limitations as
to vent configurations apply and must be strictly ad-
hered to.
The Vent Graph, showing the relationship between verti-
cal and horizontal side wall venting, will help to determine
the various dimensions allowable.
Minimum clearance between vent pipes and combus-
tible materials is 3" (76 mm) on top, and 1" (25 mm) on
the bottom and sides unless otherwise noted.
When vent termination exits through foundations less
than 20" (508 mm) below siding outcrop, the vent pipe
must flush up with the siding.
It is best to locate the fireplace in such a way that mini-
mizes the number of offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent
pipe from the flue collar of the fireplace (or the top of the
Transition Elbow) to the face of the outer wall.
Horizontal plane means no vertical rise exists on this por-
tion of the vent assembly.
When installing the appliance as a rear vent unit, the
90° or 45° Transition Elbow attached directly to the
rear of the unit is NOT INCLUDED in the following cri-
teria and calculations, and unless specifically men-
tioned should be ignored when calculating venting
layouts.
• The maximum number of 90° elbows per side wall in-
stallation is three (3). Figure 34
• If a 90° elbow is fitted directly on top of the fireplace
flange the maximum horizontal vent run before the ter-
mination or a vertical rise is 36" (914 mm). Figure 35
• If a 90° elbow is used in the horizontal vent run (lev-
el height maintained) the horizontal vent length is re-
duced by 36" (914 mm). Figures 36 & 37. This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. Figure 34
CFDV Series Gas Fireplace
Rise
FP1472
FP1472
rise in length
4/04 djt
21