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 showing the relationship between verti- cal and horizontal side wall venting will help to deter- mine the various dimensions allowable.
Minimum clearance between vent pipes and combustible materials is one 1” (25 mm) on top, bottom and sides unless otherwise noted.
When the vent termination exits through foundations less than 20” (508 mm) 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 of vent pipe from the flue collar of the fire- place to the face of the outer wall.
20' (6m)
(2.3m) | Pipe | |
Straps Every | ||
3’ (914mm) | ||
| ||
7.5' | Pipe Straps | |
Every 3’ (914mm) | ||
| ||
| Firestop/Zero | |
| Clearance Sleeve | |
| FP1012 |
Fig. 39 Support straps for horizontal runs.
Horizontal plane means no vertical rise exists on this portion of the vent assembly.
•The maximum number of 90° elbows per side wall installations is three (3).
•If a 90° elbow is fitted directly onto the fireplace flange the maximum horizontal vent run before the termination or a vertical rise is 36” (914 mm).
•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). This does not apply if the 90° elbows are used to increase or redirect a vertical rise.
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° is required in the horizontal vent it must be reduced to 17’ (5.2 m). In Figure 41, Dimension A plus B must not be
greater than 17’ (5.2 m).
CDV Series Direct Vent Gas Fireplace
3'
(914mm)
FP1237
Fig. 40 Maximum horizontal vent run.
A
B
7.5' | 1 x 90° elbow in horizontal plane = 3’ (914mm) | |
(2.3m) | ||
| ||
| A + B = 17' (5.2m) Max. | |
| FP1238 |
Fig. 41 Maximum vent run with elbows.
•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” (457 mm). 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. 42)
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