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Vjendo- <br />IF <br />TO CHECK AIR CURTAIN <br />Hold smoke stick 1 foot from front opening of <br />showcase as shown. <br />If smoke travels upward, then the air curtain is <br />present. <br />If smoke travels into showcase the air curtain <br />is not functioning correctly. <br />FIGURE 6 <br />Another indication of a non-functional air <br />curtain is the presence of condensation on <br />the inside back surface of the showcase unit <br />as shown. <br />FIGURE 7 <br />)N <br />15 <br />