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Form I-CAUA, P/N 164771 R8, Page 20

6.2.2 Venting and Combustion Air Requirements for Power Vent

Drawing Combustion Air from THE INSIDE SPACE and Venting

Flue Products to the Outdoors

If the environment has a positive pressure and is such that it is not detrimental to com-

bustion air, the power venting system in this section may be installed.

To provide combustion air to the heater, sufcient air must enter the equipment location

to replace that exhausted through the heater vent system. In the past, the inltration of

outside air assumed in heat loss calculations (one air change per hour) was assumed

to be sufcient. However, current construction methods using more insulation, vapor

barriers, tighter tting and gasketed doors and windows, weather-stripping, and/or

mechanical exhaust fans may now require the introduction of outside air through wall

openings or ductwork to the equipment room.

The requirements for combustion and ventilation air depend upon whether the unit

is located in a conned or unconned space. An "unconned space" is dened as a

space whose volume is not less than 50 cubic feet per 1000 BTUH of the installed

appliance. Under all conditions, enough air must be provided to ensure there will

not be a negative pressure condition within the equipment room or space. Follow the

specic requirements below for a conned space installation.

Conned Space Installation - Do not install a unit in a conned space without provid-

ing wall openings leading to and from the space. Provide openings near the oor and

ceiling for ventilation and air for combustion as shown in FIGURE 14, depending on the

combustion air source as noted in Items 1, 2, and 3 below.

Venter Outlet

Attachment

Requirements

2) Venter (Flue) Outlet

TABLE 12 - Venter

Model Sizes Venter Outlet Diameter

150, 200, 250 5 inches 127 mm

300, 350, 400 6 inches 152 mm

• A minimum of 12" of straight pipe is required at the venter outlet before installing

an elbow in the vent system. An elbow should never be attached directly to the

venter. An elbow attached to the straight pipe can be in any position at or above

horizontal. See FIGURE 15.

• Do not install dampers or any other type of ue restrictor device.

All pipe is eld supplied. Use either vent pipe approved for a Category III appliance or

single-wall, 26-gauge or heavier galvanized (or a material of equivalent durability and

corrosion resistance) vent pipe.

If local code requires, a double-wall terminal section may be installed with a single-wall

or Category III vent pipe run.

Or, if at least 1/2 of the equivalent vent length is vertical, vent pipe approved for a

Category I heater may be used. Single-wall pipe or double-wall (Type B) vent pipe are

suitable for use with a Category I heater.

Power Venting

Requirements

1) Type of Pipe

Outlet Size

FIGURE 14 - Conned Space:

A space whose volume is less

than 50 cubic feet per 1000

BTUH of the installed appliance

input rating











Add total BTUH of all appliances in the conned space and divide by gures below for

square inch free area size of each (top and bottom) opening.

1. Air from inside the building -- openings 1 square inch free area per 1000 BTUH.

Never less than 100 square inches free area for each opening. See (1) in FIGURE 14.

2. Air from outside through duct -- openings 1 square inch free area per 2000 BTUH.

See (2) in FIGURE 14.

3. Air direct from outside -- openings 1 square inch free area per 4000 BTUH. See

(3) in FIGURE 14.

NOTE: For further details on

supplying combustion air to

a conned space, see the

National Fuel Gas Code ANSI

Z223.1a (latest edition).

6.0 Mechanical

(cont'd)

6.2 Venting and

Combustion Air

(cont'd)

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 43 44

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