Monessen Hearth 36CDVXTRN Benutzerhandbuch

22

The vent chart should be read in conjunction with the 
following vent installation instructions to determine the 
relationship of the vertical and horizontal dimensions of 
the vent system.
1.  Determine the height of the center of the horizontal 

vent pipe exiting through the outer wall.  Using this 
dimension on the Sidewall Vent Graph (Fig. 42), 
locate the point intersecting with the slanted graph 
line. 

2.  From the point of this intersection, draw a vertical 

line to the bottom of the graph.

3.  Select the indicated dimension, and position the 

fireplace in accordance with same. 

Example A:
If the vertical dimension from the floor of the fireplace 
is 11’ (3.4 m) the horizontal run to the face of the outer 
wall must not exceed 14’ (4.3 m).
Example B:
If the vertical dimension from the floor of the unit is 7’ 
(2.14 m), the horizontal run to the face of the outer wall 
must not exceed 8¹⁄₂’ (2.6 m).

Horizontal dimension from the outside face of the 

wall to the center of the fireplace vent flange

Sidewall vent graph showing the relationship between vertical        

and horizontal dimensions for a Direct Vent flue system.

V

ertical dimension from the floor of the unit

to the center of the horizontal vent pipe

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

3     4    5    6    7   8    9  10  11 12  13 14  15 16  17 18  19  20

eg:  A

eg:  B

CFM102 

DV Graphic

9/28/00   sta

Fig. 42  Sidewall venting graph. (Dimensions in feet)

The 36CDVXT is shipped with a restrictor installed in 
the unit. This allows for a better flame when installing a 
vertical venting configuration. Below is a rough esti-
mate of opening positions based on vent length. This 
is a guide. More fine tuning can be done by a qualified 
installer. Adjust the restrictor so there is no lifting of the 
flame from the burner tube and the flame is not dirty to 
create soot.
To adjust:
1.  Loosen the two (2) screws securing the flue baffle. 

(Fig. 43)

2.  Remove two (2) screws from either side of the flue 

box. (Fig. 43) Adjust the restrictor. (Fig. 44) 

3.  Tighten the screws in the flue baffle and insert the 

two (2) screws removed earlier through the slots in 
the restrictor.

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#$684

Loosen 

Screws

Flue Baffle

Flue Pipe

FP1797

Fig. 43  Loosen screws securing flue baffle.

Remove Screws 

from Either side

Flue Box

X

FP1799
CDVXT restrictor
4/07

Restrictor

FP1799

Fig. 44  Adjust the restrictor for best flame appearance.

Up to 10’ (3 m) X = 1¹⁄₂” (38 mm)
10’ to 40’ (12 m) X = 1¹⁄v” (32 mm)