Show OF SMALL PORTABLE BLOWER A new and interesting type of small portable blower driven by compressed air has been recently brought b out by br the coppus engineering corporation of worcester massa chu under the trade name of Ven tair these machines are of exceptionally compact simple and rugged d design the buckets of the driving turbine being mounted on a manganese bronze shroud ring which is shrunk around the outer of the aluminum fan or impeller thus making a simple and integral rotating element the air nozzles are readily irremovable for cleaning or inspection and are designed for best efficiency at air air pressures of from 60 to 80 pounds gauge the fair air after being utilized for daiv in ing the turbine is exhausted into the main ventilating cur 6 rent induced by the fan so that there is no waste age 1 two stock sizes of 4 Ven tair are offered model T 3 being adaptable to use on pipe or duct of 6 to 8 in diameter diamente r and model T 4 being adaptable to auseon use on pipe or duct up to 12 in in diameter and with correspondingly larger capac ity the net weight of model T 3 is only about abou t binet ninety 1 pounds while the larger unit T 4 weighs approximately pounds the air consumption iob of thi these ese units is practically con stant irrespective v e 0 of f length of af line lifie or static pressure res gure bain being about abou 1 33 cubic feet p per er minu t e ar or 60 pounds ga gauge tige pres k sure for abdel mindert T 3 and at 75 5 pounds 6 auge gauge g about 40 cu bic feet of free air per minu minute te depending upon the length of pipe or duma duca t served or upon the static pressure they are capable pipe lint of s small 11 di twenty fv nty times volume 0 fa ir rozy ro r o f to ni fi f t ea n ct 0 e them themi i model M ode I 1 tra T 3 quire dirom ahe for example will deliver approximately cultic cubic feet of air iper minute through a length of 1400 feet of 8 in pipe or duct when supplied with about 33 cubic feet of free air per minute compressed to 60 pounds gauge the larger unit T 4 is furnished with two nozzles both being an used when operated on lower gauge pressures and one when operated on 75 or 80 pounds of air grease lubrication is provided for through stationary hollow shaft into large chamber inside bushing from which the grease is distributed by a spiral groove over wearing surface this arrangement is ver and effective and requires infrequent attention the speed of these units varies according to operating conditions from 2000 to r p ni and with simple grease lubrication provided they should stand up indefinitely and require practically no maintenance or repairs for years P W belcher dooly block salt lake is agent |