Lead sensors are recommended at supply ducts in adjoining spaces to assure the ventilation systems are working correctly. A ventilator port provides a minimum of 2 SF of openings in case of power failure. Armories are typically designed to have 15-minute Class M emergency vault ventilators and ventilator ports per UL 680 Emergency Vault Ventilators and Ports and allow for the supply of 10 CFM of outside air per 100 SF. All doors into the negative pressure area must have air locks. Supply and exhaust fan systems must have control interlocks to ensure simultaneous operation. The optimum air supply across the firing line is 75 FPM with a minimum acceptable airflow of 50 FPM with airflow maintained at 2-30 FPM at a point halfway between the firing line and the bullet trap. A slight negative air pressure must be maintained on the range, which can be achieved by exhausting typically 3 to 7 percent more air than is supplied. The design must include a positive exhaust system for removal of airborne lead. The supply and exhaust air system is critical to the operation of an indoor range and the health of building inhabitants. The ventilation system must control exposure to lead in accordance with. Ventilation and Lead Exposure Mitigation: When guns are loaded with lead ammunition and fired at close range, they release lead vapor and lead fumes as well as lead dust and other toxins.Occupancy: Occupancy Group Classification is Storage Group S Incidental Use in Group A, B, E, I, M, or R Occupancy Classification, with sprinklered Type IB construction and separation from other occupancies by 2–hour partitions.For a complete list and definitions of the design objectives within the context of whole building design, click on the titles below. Typical features of firing range space types include the list of applicable design objectives elements as outlined below. Acoustical controls must be installed to protect firing range employees and users from hearing loss due to hazardous noise levels created by discharging weapons. In addition, metal fragments from spent bullets must be controlled to avoid ricochets in the direction of shooters. Adequate volume and direction of air movement are necessary to avoid inhalation of health hazardous lead fumes and dust and carbon monoxide released during firing. For example, ammunitions contain explosives and other hazardous components, such as lead. The design, operation, and maintenance of indoor Firing Ranges also require consideration of a number of safety and health factors.
The four main considerations for indoor ranges are shooter needs, type of shooting activity, number of firing points, and number of users.
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