Preccoling of the product before sending them to Blast freezer

Generally, when a blast freezer is to be used, the product to be frozen is to be precooled. & even the chamber needs to be precooled ( empty chamber).

But are there any specific write ups on this aspect?

Sometimes the client does not bring down the temperature of the chamber & start the freezer after loading the freezer with product. With that the time to be frozen is of course extra - time needed to pull down the chamber temperate itself.

But is there any article/ write up on this aspect?