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CIRCULAR 3 6 9, U. S. DEPARTMENT OF AGRICULTURE 



Machinery that is used to pack, mix. or handle foodstuff's in any 

 way should be opened as completely as possible and all accumulations 

 of materials removed. Most fumigants do not penetrate for more 



Figure 9. — Windows sealed, on the inside wirh paper. Cracks about unions of 

 rafters and walls are sealed with plastic cement. 



than a few inches into flour, meal, or similar foodstuffs: hence, such 

 accumulations, if left in the machinery, protect insects from the 

 effects of gas. Accumulations of waste material under or around 



Figure 10. — Doorway between compartments in modern concrete storage ware- 

 house sealed for fumigation. Framework of 2- by 4-inch lumber, covered with 

 heavy fiber-reinforced waterproof paper, forced against strips of heavy felt 

 padding. The fireproof doors have been rolled back. Note the small door, 

 which also shuts against felt gaskets, for the use of fumigators. A glass 

 window has proved useful in permitting inspection of operations. 



machinery, in feed bins, or in any part of the building should also be 

 removed and sold or destroyed before fumigation. 



Commodities in warehouses or storage rooms should be so arranged 

 as to provide the maximum circulation of the fumigant : large, solid 



