The steel guards on these exhaust fans protect the fans' blades from light impacts and help prevent large debris and other objects from entering the fans. Guard-mount exhaust fans pull stale air, heat, odors, and some moisture out of indoor spaces to reduce airborne contaminants, improve indoor air quality, and allow occupants to breathe comfortably. They are suitable for use in barns, garages, and other applications with low static pressure. They also may help regulate the indoor air temperature since they circulate the air. These fans bolt to an opening in a wall and are suitable for applications where fans cannot be mounted to ceilings.