This rocket stove does not require any energy or fan to run. Here is how I'm using this invention to heat up our home    • Very simple waste oil heater  
Material used Utensil holder https://ebay.us/QP4Cz0 eBay associated link
Amazon https://amzn.to/3Uh0xQO associated link
4" stainless steel pipe https://ebay.us/ZMeLa5

DIY How to make simple vegetable oil burner at home.
How to burn waste oil with out air blower to have free heat forever.
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