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SUF SERVICE HANDBOOK
SERVICE AIDS
State Water Heaters Technical Training Department
Ashland City, Tennessee © 2004
37 STC-077
SUF MUFFLER
NOTES:
1. Install muffler in vertical position only.
2. Muffler must be a minimum of 8” from top of condensate elbow.
3. The muffler inlet and outlet are 4” PVC. If venting with a 4” PVC, a 4” x 4” PVC coupling (field
supplied) must be cemented to each end of the muffler. If venting with 3” PVC, a 4” x 3” PVC
reducing coupling (field supplied) must be cemented to each end of muffler (see illustration
above.)
4. Cement muffler into a location using ASTM D-2564 grade cement.
5. Secure muffler to suitable structure.
6. Operate heater through 1 heat cycle to ensure there are no exhaust leaks and there is no
obstruction of exhaust flow.