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You can find all the designs and instructions fof the De Monfort dual chamber medical waste incinerator below https://www.mw-incinerator.info/en/101_welcome.html
You may also want to check the WHO Best practices for incineration, concerning location, environmental impact, and occupational health and safety (OH&S) of staff https://www.who.int/water_sanitation_health/medicalwaste/en/smincinerators3.pdf
Not knowing which country you operate in, however, I would refer to the local Ministry of Health and Ministry of Environment, to make sure that you comply with all the national laws and regulations concerning healthcare waste storage, transport treatment and disposal, as well as air quality and emissions standards.