Справочник Пользователя для Sapphire Audio DV425TR

DV425TR DIRECT VENT ROOM HEATER

02/01 Page 35 250-5533

Step 7.

Continue to assemble pipe sections until

the height of the vent cap (H) (Figure 15) meets

the minimum code requirements as outlined in

the current CAN/CGA-B149 Installation Codes (in

Canada), the National Fuel Gas Code NFPA 54/ANSI

Z223.1 (in USA), or local codes. Note that for steep

roof pitches, the vent height must be increased.

See Table 1 below. In high wind conditions, nearby

trees adjoining rooflines, steep pitched roofs, and

other similar factors can result in poor draft, or down

drafting. In these cases increasing the vent height

may solve this problem.

VERTICAL INSTALLATION, cont.

Fig. 15

Dimension "H"

Obtained From

Table 1

TABLE 1

MINIMUM HEIGHT

ROOF PITCH

FEET METERS

Flat to 7/12

0.30

Over 7/12 to 8/12

1.5

0.46

Over 8/12 to 9/12

0.61

Over 9/12 to 10/12

2.5

0.76

Over 10/12 to 11/12 3.25

0.99

Over 12/12 to 14/12 5

1.52

Over 14/12 to 16/12 6

1.83

Over 16/12 to 18/12 7

2.13

Over 18/12 to 20/12 7.5

2.29

Over 20/12 to 21/12 8

2.44

The height of the vent cap must meet the

minimum building code requirements

described above.