As animate wood, but you can animate a fire no larger than the maximum volume.

Animated fire has the fire subtype and the burn special attack of a fire elemental, dealing bludgeoning damage plus fire damage on a successful slam attack and possibly setting opponents on fire (save DC 12; see page 98 of the Monster Manual).

Fire animated by this spell has hardness 0.

Material Component: A handful of charcoal, sulfur, and soda ash.