They deceased were identified as Farhad Hossain, hailing from Mirsarai upazila of Chattogram, and his assistant Sirajul Islam of Satkhira’s Kalaroa upazila.
Officer-in-charge of Joydebpur Police Station Asaduzzaman said the duo was repairing an AC on the ground floor of Eva Sweater Factory.
The gas cylinder exploded around 9:15pm while they were pumping gas to the AC compressor from it. A fire broke out at the factory following the explosion, leaving them injured.
They succumbed to their injuries on the way to hospital, the OC said.
Meanwhile, five workers got injured as they jostled to get out of the factory out of panic following the fire.
Deputy Assistant Director of Gazipur Fire Service Akhtaruzzaman said four firefighting units rushed in and brought the fire under control.
Machinery and goods of the factory were gutted in the fire, he said.