Bradford White DH-75T-60FB-3X - Manual (Page 6)

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6. Install 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.
7. Stretch the inner vent to a length that is 6 inches (15.2 cm) to 12 inches
(30.4 cm) shorter than the length needed for the vent installation (X + Y
dimension).
8. Place the spacers (springs) around the inner vent so that they are
equally spaced. Two of the spacers (springs) must be 4 inches (10.1 cm)
to 8 inches (20.3 cm) to either side of were the bend will be made in the
vent.