In a climate-controlled office, factory or warehouse, germs and allergens can build up and make your workers sick. Flu or colds can make the rounds so that somebody’s always out. Airborne allergens like dust and mold can just make people miserable.

You can control this with a simple machine you buy with your regular discount office supplies: an air cleaner. Air cleaners draw in the dirty air and release cool, fresh air. You can place several air cleaners and air purifiers around the office, factory or warehouse to cover the entire room. Be sure to assign somebody to routinely clean the filters. These can often be vacuumed out, or they can be brushed and tapped into a wastebasket. You could arrange to have your cleaning service switch the discount replacement air filters as part of their contract. Buying discount air cleaners with your office supplies is a good idea because you can be sure you can get enough of the model you want, which you can’t at your local home goods store.