Some waste oil burners have it in excess of 900 degrees while others have stack temperatures of less than 500 degrees. Also, the higher the stack temperature the greater the potential for fire hazard. Some people will try to convince you that single wall exhaust pipe is acceptable. You need to know that single wall exhaust pipe is 100% legal to purchase and 100% legal to install. However, once you turn that waste oil burner on and start to exhaust fumes you are in violation of almost all local fire codes and risk being dropped by your insurance carrier.
We recommended double or triple wall stainless steel insulated flu,s with our burners only.
If you heating an old Tin building with steel rafters a single steel pipe would be ok as long as there is nothing combustible within 3m
always worth checking with any insurance company what their requirements are and any other regulations you may have to adhere to in your area.
For the unit to draw correctly and burn clean we advise installing a flu at least 5m from floor level.
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