Vermont Casting DVT38 Manuel D’Utilisation

14

20006081

• 

A minimum of 2ʼ (610mm) vertical section off the top 

of the unit is required, an elbow and a 1ʼ (305mm) 

maximum horizontal run to get through a wall. (Fig. 

18)

• 

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. 

19)

NOTE:  Apply high temperature sealant or UL approved 

high temperature metal adhesive tape as directed on Page 

11. If non-unitized elbows are used, also secure elbows to 

straight sections with self tapping screws.

FP1012

Top vent max run

1/25/00   djt

14ʼ

 (4.3 m)

Pipe Straps 

Every 3ʼ 

(914 mm) Firestop/Zero 

Clearance Sleeve

Pipe 

Straps 

Every 3ʼ 

(914 mm)

20ʼ (6 m)

FP1012a

Fig. 17  Support straps for horizontal runs.

Minimum 2ʼ 

(610 mm) Section

Unitized Elbow 

(SK890)

• 

For each 45° elbow installed in the horizontal run, 

the length of the horizontal run MUST be reduced 

by 18” (45cm). 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” (91cm).

• 

The maximum number of elbow degrees in a system 

is 270°. (Fig. 20)

10'

(3m)

A

B

A + B = 17' (5.2m)

FP1238

Fig. 19  Maximum vent run with elbows.

2'

(610mm)

FP1237a
DVT44
horizontal plane
4/03

2'

(610mm)

X

FP1237a

Fig. 18   Minimum vertical run / maximum horizontal run.

Wall Open-

ing

(DVT44) X = 7ʼ3¹⁄₄” (2216mm) 

(DVT38) X = 6ʼ9⁷⁄₈” (2080mm)

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. 21)
For combustible walls first frame in opening.
Combustible Walls: Cut a 16¹⁄₄”H x 16¹⁄₄” W (413mm 

x 413mm) hole through the exterior wall and frame as 

shown.
Noncombustible Walls: Hole opening must be 11¹⁄₄” 

(286mm) in diameter. 
STEP 2
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. 22) Install firestop assembly. (Fig. 31)

STEP 3
Slide the zero clearance sleeve through the wall and 

install the firestop on the inside surface of the wall. 

Secure with four (4) #8 sheet metal screws.

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. 20   Maximum number of elbow degrees.