Installation of circular, classified E. Klink ducts 18 Wall penetration in a plasterboard wall • If the duct cuts a wall stud, the wall must be reinforced according to the wall manufacturer’s instructions. • The backstop can be butted up against the wall’s soundabsorbing batts. • Soundabsorbing batts in the wall can be advantageously done using hard batts. A better holddown in the backstop is achieved.
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