Bradford White UDH-75T-50FR-3N - Manuel (Page 5)

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4. Cut a 6 3/4 inch (17 cm) diameter minimum clearance hole in the wall at
the point where the vent-air intake tubes will pass through the outside
wall and connect with the direct vent-air intake terminal (See Figure 3).
5. From outside the building, slide the preassembled coaxial flexible vent
through the 6 3/4 inch hole in the wall until the outer wall mounting plate
and vent terminal are flush against the wall. Mark the mounting screw
hole locations. With a 3/16 inch (.5 cm) diameter drill bit (not supplied),
drill holes for the wall anchors (supplied). Install the wall anchors and
affix the outer wall mount plate and direct vent-air intake terminal to the
wall at this time (See Figure 3). Note: Certain construction of walls may
require the use of a different type of wall anchoring means than supplied.
DO NOT
modify the direct vent-air intake terminal or outer wall mount
plate.
Figure 3