Environmental Express AutoBlock II - Manual (Page 41)

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(6) Electronics Cooling/Purge Fan
The electronics purge fan on the rear panel reduces the possibility of acid
vapors damaging electronic components and reduces the possibility of
those same components from overheating.
(7) Safety Coating on graphite block
The graphite heating block is Teflon coated to protect it from acid spills.
(8) Fire resistant & chemical resistant construction
The AutoBlock is constructed of Kydex, a plastic resistant to both fire and
chemicals normally associated with metals digestions.