04-03-2005, 10:30 PM
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Deity
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Join Date: Apr 2004
Location: Sharon, PA, USA.
Posts: 2,211
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That would depend upon your local code. In most instances setting the draft hood in place with the pegs in the knockout holes will suffice, but some local codes require all joints on a flue to be screwed together.
The two screws are cheap and easily accessible so the best rule of thumb, when in doubt install the screws.
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