INDUSTRIAL FUMIGATION AGAINST INSECTS 



45 



type, well gasketed so that it will be airtight. An adequate venti- 

 lating system must be installed, so that the gas can be quickly re- 

 moved after the fumigation. As in the case of small fumigation 

 vaults, the ventilating stack should extend well outside the building. 



In cold climates there should be some means of heating the storage 

 room to at least 70° F. during the fumigation. 



If it is necessary to enter the storage room while it is under 

 fumigation, the operator should wear a gas mask equipped with 

 a canister designed for protection against the particular gas that 

 is being used and should remain in the room only long enough 

 to obtain the garment needed. Where concentrations of gas 



Figure 33. — Interior of fur-storage vault with racks installed for holding gar- 

 ments in best possible position for ready access and effective fumigation. 



beyond the capacity of a standard canister are likely to be en- 

 countered, the workmen should wear air-line masks with air 

 supplied from a safe source and have all skin areas protected. 



DOSAGES 



For the fumigation of the large storage sections a dosage of 14 

 pounds of the ethylene dichloride-carbon tetrachloride mixture, 15 

 pounds of ethylene oxide-carbon dioxide mixture, or 30 pounds of a 

 methyl formate-carbon dioxide mixture should be used per 1,000 cubic 

 feet of space, with a week-end exposure. 



For the preliminary fumigation of fur garments in small vaults 

 the same fumigants and the same dosages recommended for the 

 large storage sections can be used, although an exposure of 12 to 

 24 hours is sufficient. 



