A crematory is a large furnace, able to reach high temperatures – up to about 1500 – 1800 °F (850 – 970 °C), it also contains special modifications, wich ensure that the corps are eficiently disintegrated.During the cremation, u can also operate the burning efficience or ensuring that minimal environmental pollution occurs. One of the modifications, is the flame, it is aiming to the corpse’s torso, where most of the corpse’s mass rests. Modern crematoriums use a number of different fuel sources,such as natural and propane gas. They also include control systems, where u can check the inside conditions.
The body is placed in a special chamber called  the retort. Special bricks inside help to retain the heat, but after about five years, the bricks require replacement caused due continual temperatur cycling.

Modern cremators are controled by computers with interlocks and safety devices to ensure a legal and safe use, also one of these safety gadgets is the door, it can not be opened until the cremator has reached the ideal operating temperature . To avoid heat loss from opening door,the coffin has to be injected as quickly as possible into the retort.

The first step of  a cremation, is to place the body into a container,which can be a wooden casket or a simple corrugated cardboard box. These specialy built caskets, are provided by most casket manufacturers. A cardboard box that fits inside a wooden shell is another option, it is specialy designed to look like a traditional casket. After the funeral service, the interior box is removed from the shell before cremation, permitting the shell to be reused.

The body is checked to make sure anything that may damage the oven has been removed.

The box containing the body is placed in the retort. Temperatures of 760 to 1150 °C (1400 to 2100 °F) are used during the incineration, that makes a large part of the body (soft tissue and organs) vaporize and oxidized, and the gasses are discharged through the exhaust system. The hole process takes about two hours.