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Mechanical (cont'd), 2 venting (cont'd), 2 venting requirements (cont'd) – Reznor B Unit Installation Manual User Manual

Page 18: Figure 16 - venting arrangement without vent run, Vent run length table

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Form I-F/B, P/N 98126 R21, Page 18

Reznor Vent Cap

24” (610mm)

Minimum

3 ft (1M)

Minimum

Double-wall or

single-wall pipe

Roof jack

Double-wall

pipe

Tee or elbow

(cap lower

run of tee if

used)

Slope at least

1/4” per foot

(6mm per

305mm)

upward

Double-wall or

single-wall pipe

Reznor Vent Cap

24” (610mm)

Minimum

3 ft (1M)

Minimum

Roof jack

Single-wall pipe

Use thimble

through

the ceiling.

Double-wall or

single-wall pipe

Slope at least

1/4” per foot

(6mm per

305mm) upward

Tee or elbow

(cap lower run

of tee if used)

FIGURE 15 - Venting Arrangement with Vent

Run (no ceiling)

FIGURE 14 - Venting Arrangement with Vent Run

and through a Ceiling

Reznor Vent Cap

3ft (1M)

Minimum

24” (610mm)

Minimum

Double-wall

pipe

Roof jack

Double-wall or

single-wall pipe

FIGURE 16 - Venting Arrangement

without Vent Run

9. If the unit heater is installed in a space served by a large exhaust fan, be sure that

the exhaust fan does not affect the operation of the heater or the satisfactory vent-

ing of its products of combustion.

If a negative pressure exists, as evidenced by a downdraft, a factory-designed

mechanical motor driven venter (Option CA) should be installed. (The addition of

a power venter allows for horizontal venting and alters the venting requirements

including the vent pipe size and length. For additional installation information on an

optional power venter, refer to Paragraph

6.2.4. Complete information is included

in the venter package.)

In severe negative pressure conditions, makeup air equipment may be necessary.

6.2.2 Venting

Requirements (cont'd)

6. Mechanical

(cont'd)

6.2 Venting (cont'd)

Model Sizes

25/50

75

100

125

165/200

250/300

400

Vertical

Height of Vent

Vent Diameter

4"

5"

6"

7"

8"

10"

12"

Maximum Horizontal Run Length using Double Wall Type B Connector and Double-Wall Type B Vent

7 ft (2.1M)

2 ft

.6M

6 ft

1.8M

6 ft

1.8M

6 ft

1.8M

6 ft

1.8M

6 ft

1.8M

6 ft

1.8M

9 ft (2.7M)

6 ft 1.8M

6 ft

1.8M

7 ft

2.1M 16 ft 4.9M 16 ft 4.9M 16 ft 4.9M 16 ft 4.9M

10 ft (3M)

8 ft 2.4M 10 ft

3M

16 ft 4.9M 20 ft 6.1M 20 ft 6.1M 20 ft 6.1M 20 ft 6.1M

15 ft (4.6M)

12 ft 3.7M 16 ft 4.9M 16 ft 4.9M 30 ft 9.1M 30 ft 9.1M 30 ft 9.1M 30 ft 9.1M

20 ft (6.1M)

16 ft 4.9M 20 ft 6.1M 30 ft 9.1M 30 ft 9.1M 30 ft 9.1M 30 ft 9.1M 30 ft 9.1M

30 ft (9.1M)

18 ft 5.5M 20 ft 6.1M 40 ft 12.2M 40 ft 12.2M 40 ft 12.2M 40 ft 12.2M 40 ft 12.2M

Maximum Horizontal Run Length using Single Wall Metal Pipe

6 ft (1.8M

2 ft

.6M

2 ft

.6M

2 ft

.6M

2 ft

.6M

2 ft

.6M

2 ft

.6M

2 ft

.6M

8 ft (2.4M)

2 ft

.6M

5 ft

1.5M

5 ft

1.5M 10 ft

3M

10 ft

3M

10 ft

3M

10 ft

3M

10 ft (3M)

2 ft

.6M

5 ft

1.5M 10 ft

3M

15 ft 4.6M 15 ft 4.6M 15 ft 4.6M 15 ft 4.6M

15 ft (4.6M)

2 ft

.6M

5 ft

1.5M 10 ft

3M

15 ft 4.6M 20 ft 6.1M 20 ft 6.1M 20 ft 6.1M

20 ft (6.1M)

N.R.

10 ft

3M

15 ft 4.6M 20 ft 6.1M 20 ft 6.1M 20 ft 6.1M

Vent Run Length Table

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