The　leaking　safety　of　air　conditioner　using　R290　has　been　a　research　hotspot　in　recent　years,　one　method　to　lower　the　risk　of　explosion　after　leakage　is　utilizing　ventilation.　For　fresh　air　conditioner,　it＇s　common　to　use　thermal　anemometry　and　differential　pressure　flowmeters　to　measure　ventilation　flow　rate.　However,　there　is　non-negligible　error　especially　under　low　air　volume　flow　rate　conditions.　In　this　paper,　a　novel　integral-type　air　conditioner　with　heat　recovery　using　R290　is　proposed.　And　the　relevant　influencing　parameters　are　analyzed　and　experimentally　studied.　The　results　show　that　tracer　gas　method　is　an　effective　way　to　measure　ventilation　flow　rate,　and　the　novel　integral-type　air　conditioner　can　meet　the　needs　of　the　ventilation　standards.　The　air　volume　flow　rates　of　indoor　unit　fan　and　outdoor　unit　fan　are　dominant　factors　affecting　ventilation　flow　rate.　The　outlet　area　of　exhaust　air　duct　is　more　sensitive　than　the　inlet　area　of　fresh　air　duct　in　exerting　influence　on　ventilation　flow　rate,　while　the　indoor　temperature　has　a　mild　impact　on　ventilation　flow　rate.　©　2023　Elsevier　Ltd