Document reb0gjJrNE2KLz9JvYD9ggnpE

Air System Equipment Roof ventilators Allen Cooler & Ventilator Inc. Rochester, Michigan Representatives in Principal Cities See Sweet's Catalog for Further Details Write to Factory for Catalog ST- Air System Equipment AilXgclei- C. L. Ammerman Co. 110 North Second St., Minneapolis 1, Minn. EXHAUSTERS Write for specie engineers bulletin Exhausters Powered or Gravity Underfloor and Overhead Systems See Sweet's file for further details BACKWARD CURVE DIRECT CONNECTED POWER ROOF EXHAUSTER LOW SILHOUETTE ROOF FAN Allen "I-Line" Roof Fan is designed to meet the architect's demand for an at tractive low silhouette and the engineer's demand for high efficiency. This is ac complished by use of a circular spun steel hood,, and venturi, with baffle so arranged in relation to the propeller as to -.provide" maximum efficiency with minimum over-all height. Its appearance an,d quiet performance recommend it for new or old construction, such as schools and offices as well as industrial plants. lt is easy to install (no extra base required)'and it is easy to lubricate and clean. Available with Direct Drive (450 to.34,000-icfm) or with-Bell Drive (4,000 to 20,15fficfm.) - ' " VERTICAL DISCHARGE FAN Allen Type "VD" Roof Fan is designed for use where extremely high discharge velocity prevents the tendency of fumes to short circuit back through building openings. Fabricated of prime zinccoated iron sheet, welded construction throughout. Automatic wing dampers open with air blast, close weathertight when not operating. Available with Direct Drive, with motor readily acces sible, or Remote Drive, with motor in outside housing and enclosed V-belt drive. "BCD" Non-Overloading Roof or Wall Exhauster. Designed for optimum per formance at lowest possible velocities, reduces noise level to an absolute mini mum. Motor directly connected to dy namically balanced wheel eliminates costly maintenance. BELTED ROOF EXHAUSTER "PB" or "PFAS" Lo-Boy Wall or Roof Units. Efficient and quiet operation for low static pressures up to Vi inch. Rubber grommets are installed around all.points where metal contacts metal. Powered fresh air supply units on "PB" exhauster with reversed pressure blade to bring fresh air in under power. DISAPPEARING EXHAUST SYSTEMS . STAXAUSTER FAN Allen Staxauster is a simple, compact, sturdy unit that can be used to convert all types of roof ventilators into power ful exhaust or air supply units. It is available in many sizes with either Direct Drive or Remote Drive for handling corrosives and/or high temperature air. TURBINE VENTILATOR ^ gtf/, Allen Type "C" Turbine Ventilator is wind driven and economically removes ... j heated air, fumes and dust. It is made of heavy-gage coated iron or of special non-ferrous metals, and is easy to install and maintain. Many thousands of Type m C Turbines are in use in industry. /eft m1414 rim BCB" Lo-Boy Non-Overloading Centnfugal Wheel. Capacity table offers a selection of 16 wheel sizes--204 constant speed combinations with tip-speeds as low as 2000 fpm. Unit is exceptionally low in height. Standard construction consists of welded structural steel frame, heavy 16 gauge mild steel. Storm band and motor cover is 18 gauge. Under the Floor and Overhead exhaust systems for all makes and models of cars and trucks. Will accommodate flexible metal hose up to six inches in diameter. Write for Bulletin No. 6S0H. Patents No. 2571513-26666378. Others Pending 1415