Blast freezing is the process of pushing very cold air over a food product in order to freeze it as quickly as possible. There are different types of blast freezers in which the blast freezing process is a little different. Such as: Single-load blast freezers — that freeze batches of products at a time.Blast cooling, also called 'blast chilling' or 'blast freezing', is when you cool a product very quickly to a temperature that makes it relatively safe from microbial growth. Blast chillers are usually a self-contained, cabinet-style system or a space lined with insulated panels and fitted with refrigeration equipment.