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Form I-CAUA, P/N 164771 R8, Page 21

3) Vent Pipe Diameter

and Length

NOTE: If the system contains all vertical pipe or a combination of horizontal and vertical

vent pipe, the Maximum Permissible Vent Length may be increased one foot (305mm)

for each foot (305mm) of vertical rise up to a maximum increase of ten feet (3M).

FIGURE 15 - Alternate

Vent Directions

Vent in any

position above

horizontal.

A minimum of 12" (305mm) of

straight pipe is required before an

elbow.

NOTES:

• A minimum of 12"

(305mm) of straight pipe

is required before an

elbow.

• If installing a double-wall

vent run (allowed if 1/2

of vent length is verti-

cal), see FIGURE 16A for

attaching the vent pipe to

the heater.

4) Joints and Sealing

TABLE 13 - Vent Pipe Diameter and Length

Maximum Vent Length - Minimum length is 5 ft (1.5M).

CAUA Sizes Pipe Diameter Maximum Length 90°

Elbow Equals * 45° Elbow Equals *

150, 200, 250 5" (127mm) 50 ft (15.2M) 5 ft (1.5M) 2.5 ft (.8M)

300, 350, 400 6" (152mm) 50 ft (15.2M) 5 ft (1.5M) 2.5 ft (.8M)

*Reduce by this amount for each elbow.

Provide eld-supplied vent pipe as specied in Requirement No. 1 above.

• If using single wall, 26-gauge or heavier galvanized pipe, secure slip-t

connections using sheetmetal screws or rivets. Seal pipe joints either with tape

suitable for 550°F (such as Option FA1, P/N 98266) or high-temperature silicone

sealant.

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

pipe sections. When attaching Category III pipe to the venter outlet or the vent

cap, make secure, sealed joints following a procedure that best suits the style of

Category III pipe being used.

• If installing a double-wall (Type B) terminal pipe, follow the instructions in

FIGURE 16B to join the double-wall pipe to a single-wall or Category III vent pipe

run. To attach the vent cap, follow instructions in FIGURE 16C.

• If using double-wall (Type B) vent pipe in the vent pipe run (at least 1/2 of the

equivalent vent length must be vertical), follow the pipe manufacturer's instructions

for joining pipe sections. For attaching double-wall pipe to the heater, see FIGURE

16A. To attach the vent cap, see FIGURE 16C.

Figure 16A - STEP 1

Place a continual 1/4” bead

of silicone sealant around the

circumference of the venter

outlet collar.

Figure 16A -

STEP 2

Slide the double-wall pipe over

the collar so that the collar is

inside the inner pipe. Push the

double-wall pipe tight to the

heater cabinet. To secure the

connection, spaced equal dis-

tance around the pipe, drill and

insert three 3/4” long sheet-

metal screws through the pipe

and into the collar. Do not over

tighten the screws.

FIGURE 16A - Attaching

Double-Wall (Type-B)

Vent Pipe to the Venter

Outlet

A double-wall pipe run

is allowed only if at least

1/2 of the vent length is

vertical.

Do STEP 2 immediately

after STEP 1.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 43 44

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