Tunnel freezer

Claim 1

REFRIGERATING APPARATUS HAVING ADJOINING PRECOOLING AND FREEZING AREAS, MEANS FOR SEGREGATING ONE AREA FROM THE OTHER, A FORAMINOUS CONVEYOR HAVING A CONVEYING AND RETURN RUN EXTENDING GENERALLY HORIZONTALLY LENGTHWISE ALONG SAID PRECOOLING AND FREEZING AREAS, COOLING COILS LOCATED BETWEEN SAID RUNS, WALLS DEFINING THE LIMITS OF SAID AREAS, SAID WALLS HAVING OPENINGS THROUGH WHICH SAID CONVEYOR EXTENDS, A SLEEVE DISPOSED ABOUT EACH OF SAID OPENINGS AND EXTENDING FOR A SUBSTANTIAL DISTANCE ALONG SAID CONVEYOR, FLAPS EXTENDING INWARDLY FROM SAID SLEEVE IN A MANNER TO BE ENGAGED BY SAID CONVEYOR TO RESTRICT LEAKAGE THROUGH SAID OPENINGS, MEANS FOR PRODUCING FORCED CIRCULATION OF AIR ACROSS SAID CONVEYOR AND IN A DIRECTION SO THAT THE AIR WILL PASS THROUGH THE RETURN RUN OF THE CONVEYOR AND BE DISTRIBUTED THEREBY AND CAUSED TO PASS INTO CONTACT WITH SAID COOLING COILS AND RECIRCULATED BY SAID BLOWERS, A DISCHARGE FROM THE LOWER PORTION OF SAID AREAS TO THE EXTERIOR TO FACILITATE CLEANING, AND SPRAY MEANS FOR CLEANING SAID CONVEYOR EXTERIORLY OF SAID AREAS.