Firefighters were called to a fire at the animal waste processing plant, behind the incinerator on Richmond Hill, on Wednesday.
On arrival, crews were met by staff who told them that the plant room was heavily smoke logged.
Douglas fire station officer Mark Caley said: ’A breathing apparatus team was tasked with entering this room and isolating the electrical supply to the plant.
’When the room was cleared of smoke, crews alongside the staff carried out investigations to find the cause of the smoke.
’This was finally traced to a failed manifold [pipe] at the rear of the boiler unit.’