Waste management processes sometime release gases or smoke which can be harmful to people working with them. Exposure can be reduced by working in a well-ventilated area and using well-fitting good quality face masks.

Passive ventilation is better than none, but we would really like a design of an extractor fan or ventilator that sucks air up and out of the building, preferably without the need for electricity (although a small motor would be acceptable).

The design should be simple enough for any reasonably-experienced metal worker to fabricate, anywhere in the world.

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