He killed three people by setting fire to his Rozelle shop, causing a catastrophic explosion.
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But Adeel Khan, 46, continues to claim he is innocent, and will appeal his conviction and sentence.
Just five days after Khan was handed a minimum 30-year jail term in August, he lodged an intention to appeal in the NSW Supreme Court.
In June a jury found Khan guilty of the murder of Chris Noble and the manslaughter of Bianka O'Brien and her baby son Jude.
The father-of-three was sentenced to a maximum of 40 years and will be eligible for parole on September 22, 2044.
The sentence included a jail term for causing grievous bodily harm to Mr Noble's flatmate Todd Fisher, wounding his second flatmate Corey Cameron and destroying the building for financial gain.
During the course of his trial, a jury heard how Khan, knowing people lived above, set up an elaborate network of 10 petrol containers throughout the store - connected by strips of petrol-soaked material – and then set it all on fire.
He did this all for a $225,000 insurance payout.
Khan has maintained that three armed robbers tied him up for five hours before setting fire to his shop.
This was despite CCTV footage capturing him filling up containers with 38 litres of petrol at a service station two days before the fire.
Mr Noble lived directly above Khan's Darling Street shop and the O'Brien family lived above a phone shop next door.
During the trial, the court heard how Mr Noble sent his mother, Liz Noble, a text at 4.08am, saying "I love you" while he was trapped in the inferno.
In August Justice Fullerton said Khan's setting and lighting of a petrol fuelled fire was "offending of the most serious kind".
"That he did not anticipate or even consider the probability, if not the certainty, of an immediate explosion, or its force, from the quantity of petrol he dispersed simply beggars belief," she said.
After Khan was sentenced in August Ms Noble said she could not understand how anyone could have done what he did to so many other families.
"I for one am very grateful that by the time he gets out of jail I won't be here anymore. I don't need to think about him spending time with his family when we can't spend time with our family," she said.