The utility model provides an air inlet filtration system and exhaust system are constituteed of central authorities purify new trend system is independent by each other, the load simulator comprises a case, outdoor air intake and outdoor air exit are seted up towards outdoor below to the machine case, outdoor air intake accesss to the outdoor air inlet district of quick-witted incasement, the upper portion in outdoor air inlet district is horizontal baffle fresh air inlet, the filtering area is treated for the air in the top of horizontal baffle fresh air inlet, the air treats that the filtering area perpendicular is guard filter, the place ahead of guard filter is main filter, main filter the place ahead is the air-purifying district, air-purifying installs the air inlet fan in the district, the air outlet of air inlet fan accesss to indoor air intake through the acoustical panel, indoor air intake installs independent exhaust pipe inside, the exhaust pipe accesss to the district of airing exhaust, air exhaust to distinguish and install the fan of airing exhaust, the air exhaust outer air exit of air outlet junction chamber of fan.