Heat-N-Glo SL-36 Installer's Manual page 21

VENTING WITH ONE (1) 90
V (FT.)
FOR MODELS SL-32, SL-36 (CIRCULATING VERSION):
NOTE: IF A 90° ELBOW IS FIRST ATTACHED TO THE UNIT,
THE MAXIMUM HORIZONTAL RUN H IS 3-FEET.
o
ELBOW
o
H (FT.)
FOR MODEL SL-36 (CLEAN FACE VERSION):
V = 3-FEET (914mm) MINIMUM IN TABLE.