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SUF SERVICE HANDBOOK
INSTALLATION
State Water Heaters Technical Training Department
Ashland City, Tennessee © 2004
7 STC-077
VENTING CLEARANCES
This illustrates the exterior clearances for these SUF units when installed as direct vent heaters.
NOTE: 24 inches between inlet and outlet is a MINIMUM. Greater distance is recommended.
In colder climates increasing the 24” minimum to a maximum practical distance will reduce the
possibility of frost over from side winds blowing exhaust vapors into the air intake.
SUF MODEL 150 – 199
SUF MODEL 240