STEP 5
Guide the vent termination 4" collar into the 4" pipe then the 7" collar into the 7" pipe. Do not force the venting into position. If the pipes do not line up with the termination collars, disassemble elbows or pipes and reattach to the fireplace collar. (Fig. 16)
STEP 6
Recheck the fireplace to make sure that it is levelled, properly positioned, and nailed or screwed to the floor.
If applied, the fireplace adjustable frame drywall strips (nailing flanges) should be fastened. See Framing and Finishing.
FINISHED | VENT | |
WALL | ||
TERMINATION | ||
| ||
| (7DVRVT) | |
| Fig. 16 |
VERTICAL SIDEWALL INSTALLATIONS
Since it is very important that the venting 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 graph showing the relationship between vertical and horizontal side wall venting will help to determine the various vent lengths allowable. Fig. 21.
Minimum clearance between vent pipes and combustible materials is one (2") inch (25
mm)on top, bottom and sides unless otherwise noted.
When vent termination exits through foundation less than 20" below siding outcrop, the vent pipe must flush up with the siding. A 7DVSS must also be used.
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.
For some installations, it may be desirable to have some amount of the horizontal vent run immediately after the fireplace. A vertical rise must be used but can be located any- where in the vent system, to meet the perim- eters identified in the venting graph.
The maximum horizontal vent run is 20 feet (6100mm) when the vertical vent rise is 7.5 feet (2286mm). Fig. 17
| MAXIMUM |
|
| 20 ft. (6100mm) | |
|
| 48" |
| 12" | (1220mm) |
| (305mm) |
|
| 15 ft. |
|
| (4572mm) |
|
96"' (2438mm) |
|
|
VERTICAL |
|
|
DIMENSION | 7DVRT90 |
|
8 ft. MINIMUM |
| |
ELBOW |
| |
WHEN HORIZONTAL |
| |
|
| |
RUN IS 20 ft. |
|
|
| SIDE VIEW | Fig. 17 |
|
| |
- 11 -
