ɐn ˌɪnsɪdˈɛntəl bˌɛnɪfˈɪʃəl ɪfˈɛkt ɪz ðætðɪ ɛɡzˈɔːst flˈuː ɪz mˈʌtʃ smˈɔːlɚ ænd kæn biː mˌeɪd ʌv plˈæstɪk pˈaɪp sˈɪns ðɪ ɛɡzˈɔːst ɡˈæs ɪz mˈʌtʃ kˈuːlɚ.
An incidental beneficial effect is that the exhaust flue is much smaller and can be made of plastic pipe since the exhaust gas is much cooler.