VENTILATORS 



Roof Steel 

 Strap - 



Use angle upr/ghts 

 at splice joints of louvres' 



/2*" Strap at Joints 



_ litfbrackets 

 ^Latsp/icejoints 



vS* 



-* 



fc 



-* 



t 



<5auae of metal rrw / 



& 1-> I f ,-**. *WD / 



^ZZun/ess spec/f/ed ^J / 



(/engthof /ouvres <( \ 



7-0 ", no /ap . Order / 



steel U'wde. 7 ',' 6 holes t f|i. ^J 



for j "ova/ screw head V & sj^ 



A?//5 / " long 4 - ^- fe *^ 



/^* "f/ash/ng 

 Poof Steel - 



FIG. 158. SHIFFLER LOUVRES. 



Hoof 5re'e/ 

 Clinch River 



Hashing 

 Louvres made of *24 Steel 



// V/irtr 4 "^afey />? uprights. 2 * -^ 

 A?/-^ Vo/ 5Kwv head bolts 



!5"Lowre ( 

 Hashing "" 



/Roof 5 tee/- ~ 



^L/5e angle uprights at 

 '' splice joints of louvres- 





'_-*iLouvre Slock 

 I I j' Long 



FIG. 159. BERLIN LOUVRES. 



The details of the Shiffler louvres shown in Fig. 158, and of the 

 Berlin louvres shown in Fig. 159 are those adopted by the American 

 Bridge Company. The details of the louvres are shown in the cuts and 

 need no further explanation. 



