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This entity is
not in the
FGD by default.
It should not be put directly in a map because it does nothing.
This entity is
Obsolete. Its use is discouraged, and it may only exist/function in older engine branches.
env_particlefire is a point entity available in all 
Source games. It's an unused entity that should create and control fire particle effects, but the fire particles doesn't appear even in old public builds of 
Half-Life 2.
Class hierarchy