Bradford White DH-75T-60FB-3X - Manual (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 2).
5. From outside the building, position the outer wall mount plate and direct
vent-air intake terminal over the center of the opening. 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 but DO NOT 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