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6. Substantial metal equipment doors may be utilized between in- <br />take and return air courses provided that they are framed with <br />cinder block and metal and are installed in air locking pair. <br />Door will be single roll-up type with sides controlled by frame <br />and groove. (7ypical Door Installation shown on page 32.) <br /> <br />L <br />Page Sixteen <br />Added 05/27/81 <br />