Vermont Castings 360DVSR Operations Instructions download pdf (Page 17)

Vermont Castings, Majestic Products, 360DVS Series

10002547

• If a 90° elbow is used in the horizontal vent run

(level height maintained), the maximum horizontal

vent length is reduced by 36 in. (914 mm) (Fig. 23).

This does not apply if the 90° elbows are used to

increase or redirect a vertical rise.

Example: According to the vent graph (Fig. 17),

the maximum horizontal vent length in a system

with a 7

/2 in. vertical rise is 20 ft. (6.1 m), but if a

90° is required in the horizontal vent, it must be

reduced to 17 ft. (5.2 m).

NOTE: The sum of Dim. A and Dim. B must not

be greater than 17 ft. (5.2 m). See Fig. 23.

Vertical Sidewall Applications

Because it is very important the venting system

maintain its balance between the combustion air intake

and the flue gas exhaust, certain limitations concerning

vent configurations must be strictly adhered to.

• The vent graph (Fig. 17), showing relationship

between vertical and horizontal side wall venting,

will help determine allowable dimensions.

• Minimum clearance between vent pipes and

combustible materials is 1 in. (25 mm) on top,

bottom, and sides, unless otherwise noted.

• When the vent termination exits through

foundations less than 20 in. (508 mm) below siding

outcrop, the vent pipe must flush up with the siding.

• It is 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.

NOTE: When installing the appliance as a rear

vent unit, the 90˚ transition elbow

attached directly to the rear of the unit is

not included in the following criteria and

calculations. Unless it is specifically

mentioned, this elbow should be ignored

when calculating venting layouts.

Max 90 bends

1 x 90

7’6" (2.3 m)

A + B = 17’ (5.2 m)

Max.

Fig. 21 Maximum three (3) 90˚ elbows per installation

Fig. 23 Horizontal run reduction

Horizontal plane means no vertical rise exists on this

portion of the vent assembly.

• The maximum number of 90˚ elbows per side wall

installation is three (3).

• If a 90˚ elbow is fitted directly on top of the fireplace

flange, the maximum horizontal vent run before the

termination or a vertical rise is 36 in. (914 mm).

• 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 in. (45 cm). This does not apply if 45° elbows

areinstalled on the vertical part of the vent system.

• The maximum number of elbow degrees in a

system is 270°. Example shown in Fig. 24:

Elbow 1 = 90˚

Elbow 2 = 45˚

Elbow 3 = 45˚

Elbow 4 = 90˚

Total Angular Variation = 270˚

Max dist

Max. 20"

(508 mm)

Max. 36"

(914 mm)

Fig. 21 Maximum horizontal run w/ no rise

Max bends

1 + 2 + 3 + 4 = 270

Fig. 24 Maximum elbow usage

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 38 39

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Vermont Castings 360DVSR Operations Instructions Page 17

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