yup its an air con unit , i bought a new house , all kitted up with the goverment new building eco pack rules , this included the air con unit , in no way did this sway me into buying the house lol , but its very handy .....im also quite remote so smell is no issue for me , its all intake , i have drilled 3 holes in the air con pipe, that i plug with bungs from my home brewing kit , its wicked i even have a switch in my kitchen that lets me power boost each room with air con , so i can boost said pipe anytime i like =D