Turn-by-turn in front of the fan blade out from the shore where you stand. Which the breeze from the fan will help remove sulfur or sulfur emanated from the other onion.
Open the fan by turning the front of the rotor away from the side you stand, where the wind from the fan, it helps get rid of sulfur or sulfur compounds that spread out from the onion.
By turning on the fan in front of the blade (the side away from the wind from the fan, you're standing in it will help get rid of sulfur or sulfur that spread out from the onion.