Wisdom Audio Series S55i - Manual (Page 21)

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9. Once the snorkel is wrapped, and the S55is is in place with the band
clamps snugged down, screw the S55i into the studs to anchor it firmly
in place.
Screw only through the wooden flange that extends around the edge of
the face of the S55i. Fasteners should not be driven into the S55i else-
where, as there are locations in which doing so could cause permanent
damage and/or compromise its performance.
10. Finally, attach the HVAC grille by screwing it in place. The screws used
on this grille will extend into the ceiling flange’s wooden plate, making
an extremely secure cover.