State Industries STC-077 dimensions Equivalent Feet of Pipe Intake or Exhaust, Direct Venting

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

I 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°	3” MINIMUM	3” MAXIMUM	4” MAXIMUM
ELBOWS	PIPE (FEET)	PIPE (FEET)	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 4 x 3 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

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	4	State Water Heaters
STC-077		Ashland City, Tennessee © 2004