Makita AN451 Instruction Manual page 6

Use only nails specified in this manual. The use of
any other nails may cause malfunction of the tool.
Watch your footing and maintain your balance with
the tool. Make sure there is no one below when
working in high locations, and secure the air hose
to prevent danger if there is sudden jerking or
catching.
I Do not permit those uninstructed to use the tool.
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Make sure no one is nearby before nailing. Never
attempt t o nail from both the inside and outside at
the same time. Nails may rip through and/or fly off,
presenting a grave danger.