Fire broke out in a large southeast Auckland chip factory early this morning when a deep fryer caught alight.
Twelve fire trucks attended the blaze at the Mr Chips factory on Kerwyn Ave, East Tamaki, at about 3.30am, northern fire communications shift manager Colin Underdown said.
The fire, which spread through a ventilation shaft and into the roof, has been extinguished.
The building is about 30m by 50m and has high-voltage electrical wires in the roof.
Senior Sergeant Ian Benchley said the fire "bloody stunk".
"You know when someone's been frying food and they haven't opened a kitchen window, that's what it was like."
There have been no reports of injuries.
Fire safety officers are investigating what caused the blaze.