Valor Fires 940 Owner's Manual download pdf (Page 24)

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Top or Rear outlet

How to Read the Venting Chart

The chart below applies to co-axial roof or wall

termination in installations with vertical rise. See page

23 for installations with no vertical rise.

1. The total length of the vent pipe cannot exceed

40 feet (12.2 m).

2. The minimum vertical height with roof termination is

8 feet (2.44 m).

3. Any combination of rise and run can be used as

long as they are within the allowable limits shown

on the chart below.

4. A maximum of 4 x 90 degrees elbows—or

equivalent (2 x 45 degrees = 90 degrees)—can be

used.

5. Each 90 degrees elbow installed on the horizontal

plane is equivalent to a 3 feet horizontal pipe;

therefore, 3 feet must be subtracted from allowable

horizontal run. (45 degrees elbow is equivalent to

18 inches horizontal pipe.)

6. All horizontal pipe runs must be graded 1/4 inch per

foot upwards in the direction of the exhaust ﬂ ow.

The ﬁ nal pipe length, when terminating through the

wall may be graded downwards slightly to prevent

water migration.

7. Maximum co-linear venting is 40 feet (12.2 m).

8. A restrictor is required for all installations—see

Installation section for more information.

Vertical Rise (ft)

Horizontal Run (ft)

NO INSTALLATION

Example 1

Co-Axial Venting

Venting Chart—Allowable Co-Axial Vent Conﬁ gurations with Vertical Rise

Example 1

V Value = V1 (6’) + V2 (4’) = 10’

H Value = H1 (2’) + H2 (1’) = 3’

QUALIFIED

INSTALLER

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Valor Fires 940 Owner's Manual Page 24