‘This year will be different’: N.S. to implement mandatory masks for Grade 4 to Grade 12 students “It rings alarm bells for people when it sounds like the best plan to keep kids in well-ventilated spaces is to just leave the windows open in the winter and crank the heat up,” said NSTU president Paul Wozney.“A lot of these ideas sound great on paper, but they don’t line up with what it’s actually like to go to school in Nova Scotia.”It’s been proven the novel coronavirus can spread by droplets that can stay in a room if air is not properly circulated.