Parameters:
(1) ventilation system
(2) ventilation flow rate
(3) bullet stop
(4) target retrieval system
(5) structural deficiencies in building
Safe indoor range has all of the following:
(1) ventilation with average airflow velocity at firing line >= 50 feet per minute with inflow behind the firing line
(2) exhaust system is located above or behind the bullet stop, with no contaminated air reaching the firing line
(3) adequate bullet stop (escalator, venetian blind, sloping metal plate, sandpit, or approved equivalent)
(4) target retrieval system if range in use more than 30 days per year
(5) adequate building structural envelope
An indoor range of limited safety has one or more of the following:
(1) ventilation with average airflow velocity at firing line < 50 feet per minute
(2) exhaust system located < 15 feet from firing line
(3) ventilation system results contaminated air at the firing line (either through turbulence or recirculation)
(4) steel plate bullet stop is bowed or pitted but not punctured
(5) no target retrieval system if range in use more than 30 days per year
(6) 1 structural deficiency in building but building is not considered unsafe
where:
• Structural deficiencies are not listed for a range with limited safety, but no provision was made for a single structural deficiency.
• A limited safety range is one that is not safe or unsafe.
An unsafe indoor range has 1 or more of the following findings:
(1) no exhaust system, exhaust system behind firing line, or exhaust system above the firing line
(2) steel plate bullet stop is punctured
(3) use of a portable bullet stop
(4) 2 or more structural deficiencies in the building envelope making the building unsafe
