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Raypak RAYTHERM 0135B User Manual

Page 10

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Roof Pitch (X/12)

H (Min. ft)

Flat to 6/12

1

6/12 to 7/12

1.25

Over 7/12 to 8/12

1.5

Over 8/12 to 9/12

2

Over 9/12 to 10/12

2.5

Over 10/12 to 11/12

3.25

Over 11/12 to 12/12

4

Over 12/12 to 14/12

5

Over 14/12 to 16/12

6

Over 16/12 to 18/12

7

Over 18/12 to 20/12

7.5

Over 20/12 to 21/12

8

Table F: Minimum Height from Roof to Lowest

Discharge Opening

Refer to Fig. 4 for graphical reference

For connections to gas vents or chimneys, vent instal-

lations shall be in accordance with the Venting of

Equipment section of the National Fuel Gas Code,

ANSI Z223.1, or applicable provisions of the local

building codes.

Common Vents

Manifolds that connect more than one boiler to a com-

mon chimney must be sized to handle the combined

load. Consult available guides for proper sizing of the

manifold and the chimney. At no time should the area

be less than the area of the largest outlet.

Fig. 5: Minimum Venting Measurements

WARNING: These boilers must not be connected

into any portion of mechanical draft systems

operating under positive pressure. To do so may

cause the flue products to be discharged into the

living space causing serious health injury.

Fig. 6: Common Venting

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