Bradford White DH-75T-60FB-3X - Manual (Page 11)

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9. From outside the building, slide the six (6) inch (15.2 cm) diameter
telescopic tube through the opening in the wall until the outer wall
mounting plate is flush with the wall (See Figure 9).
Figure 9
10. Using the supplied special RTV silicone sealant, apply a bead one (1)
inch (2.5 cm) from the end of the four (4) inch (10.2 cm) diameter tube
that is part of the vent-air intake terminal. Slide the direct vent-air
intake terminal into the four (4) inch (10.2 cm) diameter telescopic tube
that extends through the wall and position it so it is flush with the outer
wall mounting plate. Make sure that the rain guard and the word “HOT”
on the end of the direct vent-air intake terminal are oriented properly.
Secure the direct vent-air intake terminal to the outer wall mounting
plate and wall with four (4) #10 x 1 inch screws (supplied) (See Figure
10). Note: Certain construction of walls may require the use of
different type of anchoring means than supplied. DO NOT modify the
direct vent-air intake terminal or outer wall mounting plate.