Vermont Casting DVBR36 사용자 설명서

16

V584-201

Horizontal Run

2/99   djt

10’ 

(254cm)

7’

(178cm)

8’

(244cm)

V584-201

Fig. 29  Maximum vent run with elbows.

In Figure 28 & 29, dimension A plus B must not be 
greater than 17’ (5.2m)

• 

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” (457mm). 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. 30)

Example:
   

Elbow 1 

= 

90°

   

Elbow 2 

= 

45°

   

Elbow 3 

= 

45°

   

Elbow 4 

= 

90°

  Total angular variation  = 

1
2
3
4

1
2
3
4

FP1180

Fig. 30   Maximum elbow usage.

3 x 90° 

Elbows

3 x 90° 

Elbows

FP1176

Fig. 26  Maximum three (3) 90° elbows per installation.

Max 20"

Max 20"

36" 

(914mm) 

Max.

36" 

(914mm) 

Max.

FP1177

Fig. 27  Maximum horizontal runwith no rise.

7'6"

A

B

90o

A + B = 17' (Max.)

FP1178

Fig. 28  Horizontal run reduction.

• 

If a 90° elbow is used in the horizontal vent run 
(level height maintained) the horizontal vent  length 
is reduced by 36” (914mm). (Fig. 28, 29) This does 
not apply if the 90° elbows are used to increase or 
redirect a vertical rise. (Fig. 26)

Example: According to the vent graph (Page 15) the 
maximum horizontal vent length in a system with a 
7¹⁄₂” (191mm) rise is 20” (508mm) and if a 90° elbow is 
required in the horizontal vent it must be reduced to 17’ 
(5.2m).