Biundo's detector showed dangerously high CO levels -- up to 80 parts per million in the kitchen area.
"I went outside, cleared it, went back in; it started going back up," Biundo told WINS.
Biundo evacuated the store and alerted fire officials, who discovered a problem with one of the kitchen's oven vents.
Biundo bought the detector himself for $200 when he heard about the death of a local restaurant manager, who died from carbon monoxide poisoning at a Legal Seafood in February.
Celebrity Families of 2014 [PHOTOS]