Friends and family have paid tribute to a man whose body was found in an air duct in an Adelaide homemaker shop.

Key points: Dylan Bartlett's body was found in an air vent at Noarlunga on Monday

Dylan Bartlett's body was found in an air vent at Noarlunga on Monday The circumstances surrounding his death are not considered suspicious, but are under investigation

The circumstances surrounding his death are not considered suspicious, but are under investigation Friends and family have expressed their grief on social media

Dylan Bartlett, 23, was declared missing in early September — more than six weeks before his body was recovered from the Noarlunga Homemaker Centre in Adelaide's south on Monday.

The circumstances surrounding Mr Bartlett's death remain unclear and while they are not considered suspicious, SA Police said a report was being prepared for the coroner.

In a coincidence, the discovery occurred the day before a coronial inquest heard evidence about the death of his friend, Lochlan Mortimer-Shearer, who was found deceased after a police pursuit.

Mr Mortimer-Shearer's body was discovered face down in 15 centimetres of water weeks after he crashed a stolen vehicle in June 2016.

In a post several months later, in 2017, Mr Bartlett paid tribute to the 18-year-old.

"Thinking of you always cuz … can't believe you're gone," Mr Bartlett wrote.

"You'll always be remembered and never forgotten."

Those words eerily foreshadowed tributes to Mr Bartlett himself.

Friends and family of the young Noarlunga Downs man this week took to social media to express their grief, describing him as a "character with a good heart".

"Rest in peace Dylan Bartlett, gone too soon," a friend wrote.

"This is the hardest part to take in, the tears flow as I try to push past the thought of what he went through," another said.

"The pain is too real my heart can't take it."

Mr Bartlett paid tribute to Lochlan Mortimer-Shearer in 2017. ( Facebook: Dylan Bartlett )

Another post, from the young man's mother, stated that "a mother's love [for] her own child is unbreakable".

Mr Bartlett's body was found inside a vent on Monday afternoon.

Police were called to Seaman Road at Noarlunga Centre about 4:40pm.

The man's stepfather Troy Wisman told Channel Nine it was unclear what Mr Bartlett was doing on the premises.

"I got a phone call saying that was it, he was found. That wasn't too good," Mr Wisman said, fighting back tears.

"I don't think he was trying to break in, I think he was hiding. I'm not entirely sure. The police are doing their investigation."