Vermont Casting DVR33 manual How To Use the Vent Graph, Vertical Sidewall Application, Example a

Vermont Castings, Majestic Products: DVR33

How To Use the Vent Graph

The Vent Graph should be read in conjunction with the following vent installation instructions to determine the relationship between the vertical and horizontal dimensions of the vent system.

1.Determine the height of the center of the horizontal vent pipe exiting through the outer wall. Using this dimension on the Sidewall Vent Graph (Fig. 19), locate the point intersecting with the slanted graph line.

2.From the point of this intersection, draw a vertical line to the bottom of the graph.

3.Select the indicated dimension, and position the fireplace in accordance with same.

Example A:

If the vertical dimension from the floor of the fire- place is 11’ (3.4 m) the horizontal run to the face of the outer wall must not exceed 14’ (4.3 m)

Example B:

If the vertical dimension from the floor of the unit is 7’ (2.14 m) the horizontal run to the face of the outer wall must not exceed 8Z\x’ (2.6 m)

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29
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27													To TheCentreOf	VerticalDimension
19
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25
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22
21
20
18													The HorizontalVentPipe	From The FloorOftheunit
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7
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14
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12										eg: A
11
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8
6							eg: B
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4
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3	4	5	6	7	8	9	10	11 12	13 14	15 16	17 18	19	20

Horizontal Dimension From the Outside Face of the Wall to the Center of the Fireplace Vent Flange

Sidewall Vent Graph showing the relationship between vertical and horizontal dimensions for a Direct Vent flue system.

CFM102

Fig. 19 Sidewall venting graph. (Dimensions in feet.)

Vertical Sidewall Application

Since it is very important that the venting 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 Vent Graph, showing the relationship between vertical and horizontal side wall venting, will help to determine the various dimensions allowable.

Minimum clearance between vent pipes and com- bustible materials is one 1” (25 mm) on top, bottom and sides unless otherwise noted.

When vent termination exits through foundations less than 20” (508 mm) below siding outcrop, the vent pipe must flush up with the siding.

It is best to locate the fireplace 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 (or the top of the Transition Elbow) to the face of the outer wall.

Horizontal plane means no vertical rise exists on this portion of the vent assembly.

When installing the appliance as a rear vent unit, the 90° or 45° transition elbow attached directly to the rear of the unit is NOT INCLUDED in the following criteria and calculations. Unless this transition elbow is specifically mentioned, it should be ignored when calculating venting layouts.

(3) x 90 degree elbows

Min. 7.5'

(2.3 m)

Max. 20' (6.1 m)

Fig. 20 Maximum three (3) 90° elbows per installation.

•The maximum number of 90˚ elbows per side wall installation is three (3) (Fig. 20).

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