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TheLOUPEN MACHINERY COMPANY 



Specifications 



The above capacities are based on a wind velocity of 9.3 mileb per hour, which is the average for the entire country, a difference 

 of 20 degrees between the inside and outside temperature and a straight flue 30 feet high. If you wish to know the capacity 

 of any size ventilator under conditions different than the above consult our engineering department. The service is free. 



When the Louden company decided to design and manufacture a ventilator we started planning 

 from the "ground up." The fact that some big selling ventilators were made in a certain way did not 

 influence our plans. Neither did we permit mere personal opinion to influence our decisions. We 

 purchased and have used the most expensive and reliable instruments or machines (anemometors) for our 

 tests and reached our conclusions through their records. The anemometors used are the official testing 

 apparatus of the government. 



It is a fact well known to ventilation engineers that the most efficient way to produce a draft in a flue is 

 to pass a current of air across the top of the flue. Careful tests show that a plain flue projecting through 

 the roof will give much better results than most so-called "ventilators" now in the market. 



The ideal ventilator must depend upon correct scientific principles for its construction and operation. 

 It must convert the largest possible per cent of the energy contained in the wind into a pumping or pulling 

 force to draw the foul air up the flues and out of the building. At the same time there must be no air enter 

 the ventilator from the outside to carry in rain and snow. Rain and snow entering the ventilator would run 

 down the flue, necessitating gutters to catch it and drain it out. This would be undesirable as the openings 

 would often clog up in the winter. Neither should there be any moving parts to get out of order and give 

 trouble. 



The Louden Ventilator fulfills all requirements. 

 The exhaust openings are of ample area and they are 

 all so placed that the wind blows across — never into 

 — the openings. Every opening in the Louden 

 Ventilator is an exhaust opening. No air enters 

 the ventilator at any point. Even on the side 

 exposed to the wind the air is constantly coming out 

 of all openings. No matter how strong or light the 

 wind may blow — from north, east, south, or west — in 

 a March blizzard, in April shower, or on the sultriest 

 days of August — there is always a strong, steady draft 

 up the flue that will give ample ventilation. It will 

 also do its duty regardless of the difference of 

 temperature inside and outside the building. 



The Louden Ventilator is absolutely storm proof. 



Construction of Louden Ventilators 



The appearance of Louden Ventilators is artistic 

 and attractive in its simplicity. 



The construction is heavy, rigid, and of the very 

 best materials. Neither time nor expense was spared 

 in designing this ventilator to have it accomplish the 

 needed ventilating results and be time, storm, and 

 rust resisting. 



The lower band of Louden Ventilators is strongly 

 braced inside, clear around, by eight braces. This _ 



gives the whole ventilator an exceptionally strong and rigid construction. The cone-shaped cap offers 

 the least possible resistance to the wind and gives no opportunity for rain, snow, or sleet to collect. 



The smaller sizes of the Louden Ventilator are made of 24-gauge steel, the 24 and 30 inch sizes of 22-gauge 

 steel, and the larger sizes of 20-gauge steel. All parts are carefully riveted with special rust-resisting rivets 

 or are electric welded, and at the joints the sheet metal is joined in the most scientific and substantial manner. 

 Figure 1268A shows how the ventilator is constructed. 



Fig. 1268A 



Page One hundred forty-three 



