FIRE prevention sprinklers installed in the warehouse by ASOS were key in saving the fashion retailer's stock, fire bosses have said.
A blaze broke out at the 60,000 square metre site on Park Spring Ring, Grimethorpe, at around 10pm on Friday.
Ten fire engines and more than 60 firefighters helped put out the fire, which is estimated to have caused millions of pounds worth of damage in lost stock.
But the damage could have been even greater had the building not had a sprinkler system, with the fire service urging more businesses to invest in similar preventative measures to protect their assets.
Phil Shillito, from South Yorkshire Fire and Rescue, said: "The fire suppression systems installed by ASOS were sophisticated, worked effectively and played a significant role in reducing the spread of the fire in its early stages.
"This was still a major fire and our firefighters did a tremendous job in tackling the blaze, but there's no doubt that the sprinkler system in place greatly limited the damage, and probably saved the warehouse from being destroyed."
The fire at the ASOS warehouse involved four floors and is believed to have been started deliberately.
