When every New Jersey school reopens for on-site instruction this autumn, as expected, students and teachers will be walking into intentionally drafty buildings where windows are kept open and HVAC systems are constantly running to reduce the spread of COVID-19. School officials throughout the state are already preparing their buildings to be at full capacity once again. Billions of dollars of federal relief money are flowing into New Jersey schools this year, and it can pay for everything from ensuring new filters in classroom vents to overhauling outdated heating and air conditioning systems to bring more outdoor air inside. "We're seeing this work being done across the U.S. but especially in the Northeast in New York and New Jersey, because they were hit early and hardest by COVID," said Mark Davidson, a manager for air filter manufacturer Camfil, based in New Jersey.