Rinnai RHFE-1004FA - Manual (Page 57)

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4. Wherever the air intake hose and exhaust pipe
run sideways, try to have the exhaust pipe on
top (to prevent the air intake hose from sagging
onto the exhaust pipe).
QUALIFIED INSTALLING AGENCY
The installation must conform to local codes, in the
absence of local codes, the installation must
conform with American National Standard (National
Fuel Gas Code) known as NFPA 54 and ANSI
Z223.1.1996.
Available from the American National Standards
Institute, Inc., 1430 Broadway, New York, N.Y. 10018
or from the National Fire Protection Association,
470 Atlantic Avenue, Boston, Mass. 02210.
Exhaust pipe
Exhaust pipe
Air intake hose
Air intake hose