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MIL-HDBK-1027/3B
f) Storage closet for equipment.
2.1.7
Safety Standards. A safe range is defined to be a facility that
will contain all bullets within its walls, ceiling, and floor when operated by
a qualified range officer who follows a standard operating procedure
specifically tailored for the range.  Safety standers described in pares.
2.1.7.1 through 2.1.7.3 shall be observed.
2.1.7.1
Firing Points.  Space firing points for pistol ranges and rifle or
rifle-pistol range8 as follows.
a) Pistol Ranges.  On ranges used exclusively for pistol firing,
firing points shall be placed a minimum of 4 ft (1.22 m) (preferably 4.5 ft)
(1.5 m), on center.
b) Rifle or Rifle-Pistol Ranges.  On ranges used exclusively for
rifle, or rifle end pistol firing, firing points shall be placed a minimum of
4 ft (1.22 a), preferably 5 ft (1.52 m) on center.
2.1.7.2 Openings.  No door, window, or other opening, except any required
for forced air ventilation, is allowed forward of the firing line. Where an
existing building is converted, all such openings must be brick or masonry
filled, and doors and windows securely bolted from the inside or protected by
steel safety baffles.  In new buildings, conceal all pipes and conduits in the
walls, ceiling, and floors.  Protect exposed pipes in converted buildings with
steel plates to match design requirements for the most powerful cartridge to
be used.  Commercially available safety baffles may be used.  In some
situations fire doors may be required downrange.  When fire doors are
required, they may be opened only from the range side.
Protective Baffles.  Downrange projections shall be minimized in new
2.1.7.3
construction.  All beams, columns, lights, or other projecting surfaces
downrange of the firing line shall be protected. This protection can be a
steel plate to match the most powerful cartridge used or a commercially
available safety baffle providing comparable protection.  Sheet metal baffles
placed at 30 degrees to the line of fire to protect lighting fixtures my be
constructed to thickness shown in Table 1 or may be commercially available
safety baffles.  Resign of baffle should not create a problem with vision
lighting.
2.1.8
Ventilation. The supply and exhaust air system design is critical
to the proper operation of an indoor range.  Provide a positive exhaust
ventilation system for removal of airborne lead dust (and silica dust in the
case of an existing range using sand traps).  A slight negative air pressure
should be maintained in the range.  This can be accomplished by exhausting
three to seven percent more air than is supplied.  Air inlets must have
dampers or other volume control devices which can be adjusted to retain proper
air balance.  Consideration should be given to energy recovery systems because
of the large volumes of air being exhausted.
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