Me too, never heard of 風櫃.
However, 廣州話方言詞典 (p.62) has the entry 風櫃 which is given the definition of “風車”. From Google search, 風櫃 seems to be a sort/part of air-conditioning unit.
However, 廣州話方言詞典 (p.62) has the entry 風櫃 which is given the definition of “風車”. From Google search, 風櫃 seems to be a sort/part of air-conditioning unit.