There is provided an aerosol generating device comprising: a housing having a first air inlet and an air outlet, the housing defining an air flow channel between the first air inlet and the air outlet, and a heater configured to heat an aerosol-forming substrate positioned within or adjacent to the air flow channel, wherein the housing further comprises a second air inlet, the second air inlet positioned between the heater and the air outlet, the second air inlet configured to allow air into the air flow channel, and wherein the second air inlet is larger than the first air inlet.本發明提供一種氣溶膠產生裝置,包括:殼體,具有第一氣流入口和氣流出口,該殼體界定第一氣流入口和氣流出口間的氣流通道;以及加熱器,其配置來加熱定位於氣流通道內或與其相鄰處之氣溶膠形成基體,其中,殼體又包括:第二氣流入口,該第二氣流入口位於加熱器與氣流出口之間,該第二氣流入口被配置來允許空氣進入氣流通道,且其中第二氣流入口大於第一氣流入口。111‧‧‧噴吐偵測系統113‧‧‧匣體115‧‧‧液體119‧‧‧加熱器123‧‧‧第一氣流入口124‧‧‧第二氣流入口125‧‧‧氣流出口
