The worker who died was found trying to suck the decontamination plant off the floor after an employee who began using it was overcome by steam, Burlington interim fire chief Michael Patterson told reporters.
A second worker "tried to suck the product out of the building when he was overcome," Patterson said.
Firefighters were called and the responders found that the other employee was suffering from nausea outside. An ambulance took that man to a hospital where he died, Patterson said.
Ten other people at the restaurant ̵
They were treated with oxygen, and none of them is believed to be in serious condition, according to Patterson.
The restaurant was closed for the night. Police and the federal Occupational Safety and Health Authority will investigate, Patterson said.
"We are shocked and saddened to know about this tragic accident in our franchise-owned sports bar and work closely with our franchisees and authorities while conducting an investigation," Buffalo Wild Wings said in a statement. "As the investigation is ongoing, we cannot share any further comment at this time. Further questions will need to be referred to the local authorities."
Patterson said he was told that the Super 8 is a "common product used in floor cleaning."
"For some reason tonight, it was just a reaction that led to this," he said
"It smelled horrible"
"Imagine you're in the pool, but add bleach to it. It smelled awful," Michael Burnstein told WHDH.
"I think one of the things that went through me is that we're sitting there, like, 'What are we going to do? Is everything okay? Should we even breathe in this air? & # 39; "
CNN's Carma Hassan and Swetha Sharma contributed to this report.