Commercial HVAC is provided and installed by a licensed and certified HVAC specialist and designed to pump conditioned air into a large area with a return to exhaust air out. The same holds true for a shooting range but with some very large exceptions. During the shooting of a firearm, lead, dust and various chemicals are released. Coupled with numerous firearms being discharged at the same time over long periods, this can create quite a toxic environment, as well as smoky and hard to see. Standards require that air flow at 50-75 feet-per-minute (fpm) downrange away from shooters and be exhausted with the ability to filter the heavier particulates from the air. To create laminar airflow that evenly moves air from the back of the shooting range to exhaust systems down range takes unique engineering and equipment, as well as design of the range room itself. Unlike general commercial HVAC, proper range ventilation requires that a negative pressure environment be maintained at all times in order for the bad air to be properly moved and exhausted.