Bradford White DS1-50S6FSX - Manual (Page 7)

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9. Stretch the outer vent so that it is about 6 inches (15.2 cm) shorter than
the inner vent.
10. Slide the outer vent over the inner vent, leaving about 3 inches (7.6 cm)
of inner vent exposed on each side.
11. Slide the inner wall backing plate over one end of the outer flexible air
intake. Slide the clamps over the ends of both the outer and inner vents.