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Direct venting, Venting – A.O. Smith 960 through 967 User Manual

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BTH S E R V I C E H A N D B O O K

N S T A L L A T I O N

VENTING

Equivalent Feet of Pipe Intake or Exhaust

VENT LENGTH TABLE

NUMBER OF 90°

ELBOWS

3” MINIMUM

PIPE (FEET)

3” MAXIMUM

PIPE (FEET)

4” MAXIMUM

PIPE (FEET)

ONE (1)

7

45

115

TWO (2)

7

40

110

THREE (3)

7

35

105

FOUR (4)

7

30

100

FIVE (5)

7

-

95

SIX (6)

7

-

90

4-inch PVC may be used for a MAXIMUM intake of ONE HUNDRED TWENTY (120) EQUIVALENT

FEET and a MAXIMUM exhaust of ONE HUNDRED TWENTY (120) EQUIVALENT FEET The
maximum number of 90° elbows with the 4-inch venting is six (6) on the intake and six (6) on the

exhaust. A 90° elbow is equal to five (5) equivalent feet of pipe. One (1) 90° elbow is equal to two
(2) 45° elbows. Any venting configuration using less than 50 equivalent feet should use 3-inch vent­
ing. See Vent Length Table.

The 3-inch venting terminals (provided) must be used with the 4-inch venting by adding 4x3

reducing coupling at the venting terminals. A reducing coupling is also needed immediately after

the condensate elbow (exhaust) and immediately before the 3-inch blower adapter (intake) if direct
venting is installed. See Vent Length Table.

DIRECT VENTING

The air intake provided on the unit contains a mesh screen (see Figure below) to prevent large par­
ticles from entering the unit.

3” (7.6CM) 45° PVC ELBOW WITH MESH SCREEN

MESH

SCREEN

RESTRICTOR

WARNING WHEN THE UNIT IS TO

BE SETUP AS A DIRECT VENT, THE
MESH SCREEN MUST BE REMOVED.

THE INLET VENT PIPE MAY THEN BE
GLUED TO THE AIR INTAKE (see follow­

ing Figure) PROVIDED ON THE UNIT.

Technical Training Department
TC-044 Revision 6

A. O. Smith Water Products Co.

Ashland City, Tennessee © 2004

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