Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 474
(Callahan Coinave Arm inuse luilh I fitter pivoted sash. MOTOR DRIVE When long runs of ventilators are installedin buildings or the ventilators are well abovethe floor, it is often desirable to operate orcontrol all of the vents from a central point.In such cases the Callahan motor drive is… … Fiij. 6. :lhuve is illustrated the No. 701Iuiver. Where short runs are the rule or ivhenfirst cost must lie limited, it is advisable to in-stall manually operated Callahan Controls. Fig. 7. To the left is illustrated the No. 703Iuiver. The architect and the engineer readilyappreciate the difference…
Architecture · Building · Construction industry · Engineering
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