HP 3PAR StoreServ 7450c Planning Manual page 21

Precautions must be taken to prevent material particles (concrete or metal particles for example.)
from becoming airborne. Storage systems should be powered down during construction that
requires any drilling, sawing, welding, brazing, and so on. In addition, all debris must be removed
before powering up the systems. Maximum concentrations of corrosive gases and solvent vapors
must also be considered.
Meeting Environmental Conditions 21