Vent Opening for Combustible Wall
9³⁄₈"
(240 mm)
Framing Detail
10³⁄₈"
(265 mm)
Fireplace
Hearth
Vent Opening for Noncombustible Wall
7¹⁄₂" |
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(190 mm) |
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Fig. 14 Locate vent opening on wall. |
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Adjustable | Max. Length |
Zero Clearance | 12" (305 mm) |
Sleeve |
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| #8 Screws |
| (2) |
| #8 |
| Screws |
#8 Screws (2) | (2) |
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Firestop |
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Adjustable Zero Clearance Sleeve | ZCS101 |
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Fig. 15 Adjustable zero clearance sleeve. |
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STEP 3
Measure from fireplace collar face to face of outside wall (add 2" (51 mm) for vent pipe overlap). Mark pipes and cut to length. It is very important that the two pipes are flush with the outside wall once the fireplace is in its final location. (Fig. 16)
Zero Clearance Sleeve
Firestop 
FP1404
Fig. 16 Firestop and zero clearance sleeve in place.
DVHVAC36
STEP 4
Slip 4" (102 mm) and 7" (178 mm) pipes onto respec- tive flue collars. Make sure to fix to the fireplace collar the 4" pipe with three (3) screws before fixing the 7" pipe on the 7" collar. Both pipes must be on a level plane. (Fig. 17)
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 termina- tion collars, disassemble elbows or pipes and reattach to the fireplace collar.
STEP 6
Recheck the fireplace to make sure it is levelled, prop- erly positioned and nailed or screwed to the floor.
If applied, the fireplace adjustable frame drywall strips (nailing flanges) should be fastened. Refer to Framing and Finishing.
Finished Wall
Vent Termi- nation
FP1005
Fig. 17 Side view of final unit location.
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 graph showing the relationship between vertical and horizontal side wall venting will help to determine the various vent lengths allowable. (Fig. 12)
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 foundation less than 20" (508 mm) below siding outcrop, the vent pipe must flush up with the siding. A 7DVSS must also be used.
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