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• <br /> (a) Before <br /> • <br /> Roof cap• <br /> Switch wire <br /> • <br /> • <br /> Ceiling backer <br /> III 18 <br /> inches • <br /> Switch leg wire <br /> • Hot wire <br /> (Junction box <br /> (b) After <br /> _ • Roof backer <br /> • Flange <br /> - . Roof backer <br /> Ceiling backer <br /> Vent fan <br /> Switch leg wire <br /> Hot wire , <br /> S\vitch ' <br /> $0 <br />