technical logistics of rolling l their impact. in terms of the i technical logistics of rolling out ventilation units, because the government has said it will fund 7000 ventilation units, is it pretty straight forward? the 7000 ventilation units, is it pretty straight forward?— straight forward? the number of different issues _ straight forward? the number of different issues such _ straight forward? the number of different issues such as - straight forward? the number of different issues such as does - straight forward? the number ofj different issues such as does the room have enough plug sockets, how many units will you put in classrooms? 0ther many units will you put in classrooms? other issues as well such as delivering units, cleaning filters that are present in the systems. there are a number of different practical issues that need to be understood in orderfor the rolled out to be effective. th to be understood in order for the rolled out to be effective. in terms ofthe rolled out to be effective. in terms of the cost. _ rolled out to be effective. in terms of the cost, how _ rolled out to be effective. in terms of the cost, how does _ rolled out to be effective. in terms of the cost, how does that - rolled out to be effective. in terms of the cost, how does that work i rolled out to be effective. in terms i of the cost, how does that work out? the more units you put in, the lower the cost, but the costs are still substantial. the question is, is this the best investment to make? we all passionately want to keep children and young people in schools and we just but they want to improve outcomes for children and young people. the question is, is this where money is best spent and that's what we're trying to establish with the trial. we need a solid evidence