When is a red fail sticker attached to an extraction hood?
 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 
   Source of Information: HSG258 Controlling Airborne Contaminants at Work: A Guide to Local Exhaust Ventilation
   version 1.0

Sheet 37