Valmiki Ramayana Sundara Kanda Sarga 54 Shloka 22
Original Shlokaप्रदीप्तमग्निं पवनस्तेषु वेश्मस्वचारयत्। अभूच्छ्वसनसंयोगादतिवेगो हुताशनः।।5.54.22।।
1 source checked for this shloka
पवनः wind, प्रदीप्तम् burning, अग्निम् fire, तेषु in those, वेश्मसु in houses, आचारयत् spread, श्वसनसंयोगात् combining with wind, हुताशनः fire, अतिवेगः at high speed, अभूत् spread.
Combined with the wind the fire began to spread, burning the houses with great speed.