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Columbia Installation and Operation ManualNote that secondary air tubes (A) can be replaced without removing <strong>the</strong> baffle frontsupport (B), <strong>the</strong> baffle board (C), <strong>the</strong> insulation blanket (D) and <strong>the</strong> insulation blanketweight (E).Important Notes:The air tubes are identified for placement as follows:ModelType of tubeColumbia Front ► 40 holes of 0.156"Middle ► 80 holes of 0.109"Rear ► 80 holes of 0.109"48