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• A cremation furnace is a large furnace capable of reaching high temperatures up to approximately 1600-1800 degrees fahrenheit (1600-1800 °F = 871-982 °C), with special modifications to ensure the efficient disintegration of the corpse. One of these modifications is the aiming of the flames at the corpse's torso, where a majority of the corpse's mass rests.


• A cremation furnace is not designed to cremate more than one body at a time, and to do so is against the law in all 50 US states and many other nations.


• Cremators are a standard size. Large cities will have access to an oversize cremator that can handle deceased in the 200+ kg range. However, the morbidly obese cannot be cremated and must be buried.


• The box containing the body is placed in the retort and incinerated at a temperature of 760 to 1150 °C (1400 to 2100 °F). During the cremation process, a large part of the body—especially the organs and other soft tissue—is vaporized due to the heat and is discharged through the exhaust system. All that remains after cremation are bone fragments, representing about five percent of the body's original mass, and the ashes of the cardboard box or wooden container. The entire process usually takes about two hours.


• Jewellery, such as wristwatches and rings, are not removed. The only non-natural item required to be removed is a pacemaker. The undertaker is required to sign a declaration to the operator that any pacemaker has been removed. A pacemaker could explode and damage the cremator. The undertaker will remove a pacemaker prior to delivering the body to the crematorium.


• In Japan and Taiwan, the bones are not pulverized unless requested beforehand.


• An unavoidable consequence of cremation is that a tiny residue of bodily remains is left in the chamber after cremation and mixes with subsequent cremations.


• Not all that remains is bone. There will be melted metal lumps from jewellery, casket furniture, and dental fillings, and surgical implants such as hip replacements. After grinding, these are sieved out and later interred in common, consecrated ground in a remote area of the cemetery.


• There is a growing body of research that indicates cremation has a significant impact on the environment:
  The major emissions from crematories are: nitrogen oxides, carbon monoxide, sulfur dioxide, particulate matter, mercury, hydrogen fluoride (HF), hydrogen chloride (HCl), NMVOCs, and other heavy metals, in addition to Persistent Organic Pollutants.
  According to the United Nations Environment Programme report on Persistent Organic Pollutants (POP) Emission Inventory Guidebook, emissions from crematoria, although comparatively small on an international scale, are still statistically significant. The POP inventory indicates that crematoria contribute 0.2% of the global emission of dioxins and furans.
  Persistent Organic Pollutants include Dioxins and Furans, PAHs, benzo(a)pyrene, benzo(ghi)perylene, Benzo(k)fluoranthene, Fluoranthene, Indendo(123-cd)pyrene, Benzo(b)fluoranthene, Benz(a)anthracene, Dibenz(ah)anthracene, PCBs (Nos. 126, 169, 77, 118, 105, 123, 114, 156, 157,167, 189), Hexachlorobenzene, Toxaphene, Chlordane, Aldrin, DDT, Mirex, Dieldrin, Endrin, Hexabromobiphenyl, Pentachlorophenol, Heptachlor, Chlordecone, Short Chain Chlorinated Paraffins (SCCP), Lindane.


• List of fictional people who were cremated