ɐ smˈɔːl lˈiːk ʌv kəmbˈʌstʃən ɡˈæsᵻz ˌɪntʊ ðə hˈiːɾᵻd ˈɛɹ kæn biː dˈeɪndʒɚɹəs tə ðɪ ˈɑːkjʊpənts ʌvðə hˈiːɾᵻd spˈeɪs, bɪkˈʌz ʌv pˈɑːsᵻbəl kˈɑːɹbən mʌnˈɑːksaɪd bˈɪld ˈʌp.
A small leak of combustion gases into the heated air can be dangerous to the occupants of the heated space, because of possible carbon monoxide build up.