CIRCULAR VENTILATORS 321 



There are many styles of circular ventilators on the market, a few 

 of which are shown in Fig. 161. The Star ventilator made by Mer- 

 chant & Co., Chicago, is quite often used and is quite efficient. It is 

 made in sizes varying from 2 to 60 inches. In 1903 Star ventilators 

 made of galvanized iron were quoted about as follows: 12-in., $2.00; 

 i8-in., $6.75 ; 24-in., $10.00; 4<D-in., $45.00. 



The Globe ventilator made by the Cincinnati Corrugating Com- 

 pany, Cincinnati, Ohio; the Garry ventilator made by the Garry Iron 

 & Steel Roofing Co., Cleveland, Ohio ; and the Acorn and Buckeye ven- 

 tilators made by the Youngstown Iron & Steel Roofing Co., Youngs- 

 town, Ohio, are quite efficient and all cost about the same as the Star 

 except the Garry ventilator, which is cheaper. 



Home-made circular ventilators can be made that are quite as sat- 

 isfactory as the patented ventilators and are much less expensive. In 

 1900, ten 36-inch circular ventilators cost $12.25 each, and two 24- 

 inch circular ventilators cost $9.25 each in Minneapolis, Minn. The 

 cost of the 24-inch ventilators was large on account of the small number 

 made. 



