Ventilation systems can only control the temperature but cannot be used for controlling dust particles in the foundry.

Foundry Environment Health & Dust Problem in Foundries topics include: Foundry environment health and safety, dust measurement, dust control, foundry dust extraction and dust collecting equipment. Foundries have many health hazards, including: Dust: Foundries have large amounts of fine respirable dust that contains silica. Fumes: Fumes from zinc and copper can cause metal fume fever. Fumes and dust from cadmium, beryllium, nickel, and chromium are toxic. Other materials: Foundries also have silica sand, chromium, carbon monoxide, carbon, iron oxide, and fluorides.  Other health risks... Show more

Foundry Environment Health & Dust Problem in Foundries topics include: Foundry environment health and safety, dust measurement, dust control, foundry dust extraction and dust collecting equipment.

Foundries have many health hazards, including:
Dust: Foundries have large amounts of fine respirable dust that contains silica.
Fumes: Fumes from zinc and copper can cause metal fume fever. Fumes and dust from cadmium, beryllium, nickel, and chromium are toxic.
Other materials: Foundries also have silica sand, chromium, carbon monoxide, carbon, iron oxide, and fluorides. 

Other health risks related to foundries include:
Exposure to molten metal fume
Heat and spray mists
Noise
Temperature
Splashing molten metal 

If these hazards aren't controlled or prevented, they can threaten the health of foundry workers and their effectiveness. 
To reduce silica dust, some recommend using ventilator suits to quarantine the air operators breathe from the contaminated air.

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