CFM Corporation DVT38IN - Manual (Page 19)

19
Chateau™
20011956
• 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. (Fig.
18)
• 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.
For each 90° elbow installed in the horizontal run,
the length of the horizontal run MUST be reduced by
36” (914 mm).
• The maximum number of elbow degrees in a system
is 270°. (Fig. 19)
10'
(3m)
A
B
A + B = 17' (5.2m)
FP1238
Fig. 18 Maximum vent run with elbows.
1
2
3
4
FP1239a
Sidewall maximum
bends
DVT44
4/03
Example: In Figure 23
Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 270°
FP1239a
Fig. 19 Maximum number of elbow degrees.
VO584-100
Vent Opening
2/99 djt
Vent Opening for Combustible Wall
16¹⁄₄”
(413 mm)
Fireplace Hearth
Framing
Detail
Vent Opening for Noncombustible Wall
11¹⁄₄”
(286 mm)
VO584-100
Fig. 20 Locate vent opening on wall.
16¹⁄₄”
(413mm)
ZCS101
Zero Clearance Sleeve
3/11/99 djt
Adjustable Zero
Clearance Sleeve
Max. Length
12” (305 mm)
#8 Screws (2)
#8 Screws (2)
ZCS101a
Fig. 21 Adjustable zero clearance sleeve.
STEP 1
Locate vent opening on the wall. It may be necessary
to first position the fireplace and measure to obtain hole
location. Depending on whether the wall is combustible
or noncombustible, cut opening to size. (Fig. 20)
For combustible walls first frame in opening.
Combustible Walls: Cut a 16¹⁄₄”h x 16¹⁄₄” w (413 mm x
413) hole through the exterior wall and frame as shown.
Noncombustible Walls: Hole opening must be 11¹⁄₄”
(286 mm) in diameter.
STEP 2
Sidewall Installation
Measure wall thickness and cut zero clearance sleeve
parts to proper length (MAXIMUM 12”/305 mm). As-
semble sleeve using #8 sheet metal screws (supplied).
(Fig. 21) Install firestop assembly. (Fig. 30)
Zero clearance sleeve is only required for
combustible walls.