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Natural forced ventilation in Bio Tank fitted toilets

Location, Zonal Railway/Division/Units where used : 
Bilaspur division, SEC Railway
Contact Person: 
Brief description: 

Prior to fitment of Bio Tanks in coach toilet, natural ventilation was available through commode chute. During run, air enters and taken away all the foul smell generated due to defecation and urination. After fitment of bio tank, the problem of foul smell persisted and was a source of passenger complaint.

To overcome the problem of foul smell Natural forced ventilation system has been evolved using funnels. Two funnels have been provided in a coach facing forward and reverse directions each. Funnels are connected with coach toilet through pipes.