Production lines at Timber Products’ Medford particle board plant are silent following a two-alarm fire Tuesday night. Timber Products Vice President David Smith, who was in Medford Wednesday to inspect the damage, wasn’t sure when the plant’s 96 employees would return to action. “It’s too early to tell right now when we’ll reopen,” Smith said. “We’re still evaluating the facility.” The company’s plywood and veneer mills, adjacent to the particle board facility at the northeast corner of Sage and West McAndrews roads, remained in operation.