used positive gastronomy blast chiller, in reality it would be a positive blast chiller to which some modifications have probably been made because we have tried it and it works very well (see video) with a carafe of water that has completely frozen and therefore also does negative blast chilling. Lainox brand mod. ABR102S completely in stainless steel equipped with 4 fans Ø23cm. dimensions: 107X79cm h177cm, compartment 52X53cm GN2/1 (unfortunately the guides for the trays are missing, we have something to check at the time of purchase)