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232 Air System Equipment ** vmu THE G. C. BREIDERT CO. P.O. BOX 1190, San Fernando, Calif. Representatives in All Principal Cities POSITIVE VENTILATION GUARANTEED... NO MATTER WHICH WAY THE WIND BLOWS! **+ * -> Breidert AIR-X-HAUSTER... famous gravity-flow ventilator developed from principles of aerodynamics; proven by years of use in all types of application. Transforms winds from straight-downward to SO de grees upward into positive suction--without a single moving parti Trouble-free, maintenance-free, weather proof. Guaranteed backdralt-proof, barring internal negative pressures. HORIZONTAL DISCHARGE ELIMINATES DOWN-DRAFTS! NEW! SPECIAL VENTILATORS FOR FORCED-AIR SYSTEMS! Breidert POWAIR-X-HAUSTER ... Unique power unit provides pleasing, unobtrusive appearance on top of any roof. Discharges air on a straight horizontal plane--preventing conventional back pressures and roof deterioration caused by downward discharge of ordinary power ventilators. Downdraft-proof against winds from any direction when fan is off (barring in ternal negative pressure). Operates as a gravity venti lator when power is off! MORE VENTILATION PER DOLLAR! Breidert "AIR-OUT"... now available to meet the special requirements of forced-air duct systems. It's the same low-silhouette Powair-X-Hauster head (at left) without motor and fan assembly. Specially de signed to provide an internal static resistance much lower than that of ordinary discharge heads. Like the Powair-X-Hauster, the new Air-Out discharges fumes horizontally--and boasts an architecturally-pleasing appearance to enhance any roof top! INSIST ON CERTIFIED CAPACITY RATINGS BASED ON VARIABLE WIND CONDITIONS--This is your assurance that the ventilators you specify will perform efficiently in actual use'. Capacity ratings'of It takes fewer Breidert ventilators to do the job than conventional ventilators of the same sise* OR use the same number of imaU<r*tu< Braiderts to do the job of converttional ventilators. Breidert ventilators are certified by Pittsburgh Testing Laboratory. Breidert POWAIR-X-HATJSTERS carry the Certified Rating Seal of the Air Moving and Con ditioning Association. Breidert single-phase power roof ventilators also carry Underwriters' Laboratory ap proval. WRITE FOR ENGINEERING DATA BOOK--*4 pages of installation photos, certified capacity ratings, complete specifications. Air Syttem Equipment . Hirschman-Pohle Co., Inc. Since 1908 200 Lent Ave. LeRoy, N. Y. Sales Representatives in Principal Cities Manufacturers of all types of Power and Gravity Roof Ventilators 233 New Low Profile Electric Ventilator Type "CK" The Type "CK" LOW PROFILE STATICK Power ventilator shown has been designed in response to the demand for the ABSOLUTE MINIMUM IN OVERALL HEIGHT for a ventilator using backward curved blade centrifugal fan, and is available in a wide range of capacities either direct or belt driven, with or without dampers or other extras as needed. The same LOW PROFILE type of housing is available using a propeller fan, or for gravity, pres sure relief or intake. The latter is available in oblong shapes or sizes as may be needed, with or without our Insulated Double Shell steel curb of one of the several standard types. Any or ell of these ventilators subject to modification to meet the need of any building project. * Type LAC STATICK Power Roof Ventilator This model features the damper housing as an integral part of the ventilator where the damper is ac cessible for cleaning. It shows the electric damper control mounted in the motor chamber where it is also readily accessible because of the hinged cowL Our Type "LAC'* STATICK Power ventilator designed for efficient exhaust at either low or high static pressure, using non-overloading backward curved blade centrifugal fan, available in many sizes for almost any required capacity. The Type ULC" STATICK Power ventilator (not shown) uses a similar construction minus the damper housing. Capacity ratings for belt driven sizes of the Types "LC" and "LAC" STATICK Power ventilators have been formally approved by Air Moving Conditioning Association, and carry their CERTIFIED RAT ING SEAL. See Sweet's Architectural, Engineering, or Industrial Construction Files. Complete data on any or all types gladly furnished on request.