Bradford White UDH-75T-50FR-3N - Manuel (Page 6)

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6. Slide the inner wall backing plate over the free end of the outer flexible
air intake until it is flush with the inside wall. Mount the inner wall
backing plate to the inside wall. Slide the clamp over the end of the outer
vent.
7. Install the vent adaptor into the flue reducer. Use the high temperature
RTV silicone sealant provided to seal the joint by applying it to the
adaptor before inserting the adaptor into the flue reducer.