Alexander Thompson / somerville@wickedlocal.com Somerville parents’ fury over the city’s long-delayed school reopening plans boiled over at the Somerville School Committee’s contentious Feb. 8 meeting even as school officials confirmed they will deploy portable air filters to return students to classrooms sometime in the coming months. “Realizing how close we are to the Rubicon and not wanting to disrupt the day of occupancy, we’re essentially mobilizing plan B through a mix of different methods,” Rich Raiche, the city’s director of infrastructure and asset management, told the committee. The city currently owns about 150 portable air filters and has 100 more on order, Raiche said.