As　a　novel　ventilation　method　for　fully　mechanized　excavation　face,　i.e.,　wall-mounted　air　duct,　has　outstanding　advantages　in　solving　the　problems　of　dust　pollution　and　gas　overrun.　In　order　to　decide　the　best　installation　location　of　the　wall-mounted　air　duct,　a　physical　model　was　developed　proportional　to　the　dimensions　of　C103　fully　mechanized　excavation　face　of　the　Nahe　Coal　Mine　of　the　Bai　Coal　Group　in　Baise,　Guangxi　Province.　The　CFD　numerical　method　was　used　to　analyze　the　air　flow　field,　dust　concentration　distribution　and　gas　diffusion　of　the　excavation　face　when　the　wall-mounted　air　duct　was　installed　at　different　positions.　The　results　showed　that　the　dust　and　gas　control　effect　in　the　fully　mechanized　excavation　face　was　highly　dependent　on　the　installation　location　of　the　wall-mounted　air　duct.　When　the　wall-mounted　air　duct　was　installed　farther　away　from　the　working　face,　on　the　one　hand,　the　wind　curtain　moved　backward　and　the　dust　control　effect　was　poorer;　on　the　other　hand,　the　gas　was　diffused　to　a　larger　distance　and　the　concentration　of　gas　in　front　of　the　working　face　was　lower.　For　the　investigated　fully　mechanized　excavation　face,　the　reasonable　installation　distance　of　the　wall-mounted　air　duct　should　be　9.6　m.　At　this　installation　distance,　the　concentration　of　gas　on　the　working　face　roof　was　0.65%,　and　the　concentration　of　dusts　around　the　roadheader＇s　driver　was　59　mg/m3.　©　2020　Institution　of　Chemical　Engineers