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Centennial College · PDF fileDraft at the breech How draft controls work Testing for a leaking furnace heat exchanger-—-—— Lock out tag out Practical tips loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220517235ab006ed7f8b9a6b308e08e5html5thumbnails9jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=10Page 10button div class=ts-imageimg data-url=img-0002-centennial-college-at-the-breech-how-draft-controls-work-testinghtmlpage=10 data-page=10 class=ts-thumb lazyload alt=Page 10: IMG 0002 - Centennial College · PDF fileDraft at the breech How draft controls work Testing for a leaking furnace heat exchanger-—-—— Lock out tag out Practical tips loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220517235ab006ed7f8b9a6b308e08e5html5thumbnails10jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=11Page 11button div class=ts-imageimg data-url=img-0002-centennial-college-at-the-breech-how-draft-controls-work-testinghtmlpage=11 data-page=11 class=ts-thumb lazyload alt=Page 11: IMG 0002 - 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