The snow horn is utilized for producing solid CO2 particles from CO2 in its liquid form. The device has a downwardly directed skirt with a cylindrical, or preferably, a truncated, conically tapered shape which is open at its lower, larger diameter end.

A hemispherically-shaped head is mounted at the top, smaller diameter end of the skirt and an orifice means is mounted substantially at the radial center of the head for allowing the expansion of the liquid CO2 inside the head and skirt.

The gas venting system consists of a concentric hood mounted at its lower edge to an outwardly directed annular flange which is secured about the lower end of the snow horn skirt so as to form an enclosed chamber about said head and skirt.

A port means opens into the enclosed chamber at its lower end and an exhaust means opens into said enclosed chamber at its upper end for drawing the CO2 gas through the port means and out of the enclosed chamber.