Faber — Why is there no duct pipe in the chimney box??

I ordered a Faber chimney from Amazon because of the features and reasonable price. But, I do not understand why there is no duct pipe included in the chimney delivered, why do I have to purchase it separately. I am okay to pay the installation charges but a duct pipe is an attachment that allows the chimney to function. Why should I buy it separately? It is as equivalent to apple selling mobile phones without chargers.
Do you guys not think about your customers while making such decisions. Anyway, I am cancelling my order and going ahead with a local vendor who is providing all the features of a Faber chimney, plus installation including duct pipe and a lifetime guarantee. All of this in the price of just a chimney that you are offering.