Monessen Hearth 36CDVXTRN Benutzerhandbuch

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CDVX Series Direct Vent Gas Fireplace
20012253
needs to have an immediate rise before going hori-
zontal. NOTE: Be careful not to distort the outer flex 
as this will affect the performance of the fireplace. 
6.  Secure the collar to the firestop by bending the tab 
out on the firestop and running a screw through the 
tab and collar.
7.  From outside the house, slide the termination onto 
the collars sticking through the firestop.
8.  Secure the termination to the house with the four (4) 
screws provided. Be sure to seal around the termi-
nation and house cladding.
Vertical Sidewall Applications
Since it is very important that the vent-
ing system maintain its balance between 
the combustion air intake and the flue 
gas exhaust, certain limitations as to vent 
configurations apply and must be strictly 
adhered to.
The Vent Graph shows the relationship between vertical 
and horizontal side wall venting and will help to deter-
mine the various dimensions allowable. 
Minimum clearance between vent pipes 
and combustible materials is 1” (25 mm) 
on top, bottom and sides unless otherwise 
noted.
When vent termination exits through foundations less 
than 20” below siding outcrop, the vent pipe must 
flush up with the siding. It is always best to locate the 
fireplace in such a way that minimizes 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 to the face of 
the outer wall.
Horizontal plane means no vertical rise exists on this 
portion of the vent assembly.
• 
The maximum horizontal vent run is 20 ft. (6.1 m) 
when the vertical vent rise is 7¹⁄₂ ft. (2.3 m). (Fig. 26)
• 
The maximum number of 90° elbows per side wall 
installation is three (3).  
• 
If a 90° elbow is used in the horizontal vent run 
(level height maintained) the maximum horizontal 
vent length is reduced by 36” (914 mm). (Fig. 27) 
This does not apply if the 90° elbows are used to 
increase or redirect a vertical rise. (Fig. 28)
V584-201
Horizontal Run
2/99   djt
10 ft.
(3048 mm)
7 ft. 6 in.
(2286 mm)
7 ft.
(2134 mm)
A
B
CFM147
Fig. 28  Maximum vent run with elbows.
90° Elbow = 3 ft.
A + B = 17 ft. (Max.)
Maximum 
3' (914mm)
CFM142
Venting
2/2/01  sta
CFM142
Fig. 27  Maximum horizontal vent run.
7TCDV90
  Example:  According to the chart the maximum 
horizontal vent length in a system with a 7.5’ (2.3 m) 
vertical rise is 20’ (6 m) and if a 90° elbow is required 
in the horizontal vent it must be reduced to 17’ (5.2 
m). In Figure 28 Dimension A plus B must not be 
greater than 17’ (5.2 m).
• 
The maximum number of 45° elbows permitted per 
side wall installation is two (2). These elbows can be 
installed in either the vertical or horizontal run. 
• 
For each 45° elbow installed in the horizontal run, 
the length of the horizontal run MUST be reduced by 
18” (45 cm). This does not apply if the  45° elbows 
are installed on the vertical part of the vent system.
• 
The maximum number of elbow degrees in a system 
is 270°. (Fig. 29)
CFM141
2/2/01   sta
Maximum 
20 ft. (6.1m)
7.5' 
(2.3m)
Vertical Dimension 
7¹⁄₂’ Minimum When 
Horizontal Run is 
20’
CFM141
Fig. 26   Maximum number of 90° elbows is three (3).
7TCDV90
7TDV90