use (a chemical) in a well-ventilated area

"Ventiation" means allowing air to move between the indoors and outdoors. This can be done with windows, vents, or fans.

Chemicals which are dangerous for people to breathe often have a warning. The warning says that you should use the chemical in a "well-ventilated area", so that the person using it can get fresh air.

This phrase appears in these lessons: