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Blast freezers are designed in many ways for fast freezing various food products such as fish and meat by blowing very cold air upon the products to be frozen for 8 to 24 hours until the frozen product reaches a core temperature of minus 12 to minus 20 C. Blast freezers are operated at minus 40 degrees C or lower.

A typical blast furnace consists of a small insulated cabin where strong fans are place right behind or on top of a cooling coil grid which is open in the front or partitioned to ensure air flow through the produce and back to fan suction -the strong gush of cold air hits the product to be frozen racked or hung right in front

and the job is done. Blast freezers could have a single door for loading and unloading or with separate doors for the same.

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