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Form I-CAUA, P/N 164771 R8, Page 10

3) Pipe Diameter and Length

Pipe diameter and length requirements listed in TABLE 7 are for the indoor sections of

pipe between the heater and the concentric adapter box. The diameters of the outside

(terminal) concentric pipes are listed in TABLE 8. The outdoor lengths depend on the

installation; requirements are listed in the installation instructions for the horizontal and

vertical vent/combustion air kits.

Vent pipe diameters and maximum vent lengths in TABLE 7 apply to both horizon-

tal and vertical vents. Add all straight sections and equivalent lengths for elbows.

The total length of the straight sections and elbows must not exceed the Maximum

Length. Minimum length is 5 ft (1.5M).

Vent and Combustion

Air Pipes Between

the Heater and the

Concentric Adapter

TABLE 7 - Pipe

Diameter and Length

from Heater to

Concentric Adapter Box

• Minimum length between the heater and the concentric adapter box is 5 feet

(1.5M).

Concentric Pipes

TABLE 8 - Diameter of

Outdoor Concentric

Pipes

NOTE: Length is

determined by the

installation.

Provide pipe as specied in Requirement No. 1 and seal joints as follows:

• If using Category III vent pipe run, follow the pipe manufacturer's instructions for

joining and sealing Category III vent pipe sections.

• If using single-wall, 26-gauge or heavier galvanized vent pipe run, secure

slip-t connections using sheetmetal screws or rivets. Seal all joints with high

temperature aluminum tape or silicone sealant.

• To seal joints in the single-wall combustion air pipe, secure slip-t connections

using sheetmetal screws or rivets. Seal all joints with aluminum tape or silicone

sealant.

• When joining the terminal section of double-wall vent pipe to the vent cap,

follow the illustrated instructions in FIGURE 4A, page 11.

When joining the terminal section of double-wall vent pipe to a single-wall or

Category III vent pipe run, follow the illustrated instructions in FIGURE 4B, page

11.

When joining two sections of terminal double-wall vent pipe in a vertical vent

installation, follow the pipe manufacturer's instructions for joining pipe sections.

5) Joints and Sealing

6.0 Mechanical

(cont'd)

6.2 Venting and

Combustion Air

(cont'd)

Pipe Diameter and Maximum Pipe Length from Heater to Concentric Adapter

CAUA

Pipe Diameter

Maximum

Length

Equivalent Straight Length for a

Vent Pipe Inlet Air Pipe 90° Elbow 45° Elbow

inches mm inches mm feet M feet M feet M

150, 200 5 127 5 127 40 12.2 5 1.5 2.5 0.76

250 5 127 6 152 50 15.2 5 1.5 2.5 0.76

300, 350, 400 6 152 6 127 50 15.2 5 1.5 2.5 0.76

Diameters of Concentric (Outdoor Terminal) Pipes

Size 150 200 250 300 350 400

Inlet Air

Pipe

inches 6 6 8 8 8 8

mm 203 203 203 203 203 203

Vent

Pipe

inches 4 4 5 5 5 5

mm 152 152 152 152 152 152

4) Condensation

Any length of single-wall vent pipe exposed to cold air or run through an unheated

area or an area with an ambient temperature of 45°F or less must be insulated along

its entire length with a minimum of 1/2" foil-faced berglass, 1-1/2# density insulation.

Where extreme conditions are anticipated, install a means of condensate disposal.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 43 44

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