Many think that "duck tape" is a misnomer for "duct tape", but this is not true.
Whatever you call it, how long do you think it will be before someone asphyxiates while attempting to follow this advice?
Duct or duck, it's not going to save us from biochemical warfare. I'm supposed to seal myself into a room with it? Great. That feels really safe. The equivalent of holding a book over your head as a piano falls on you.