ANSWER:

No, they should fill the gaps in the rows before going to the next room. However, their prayer is valid

QUESTION: If the masjid has AC ( Imam leads) & Non AC halls with speakers & during congregation prayer, 1 or 2 persons formed a row on Non AC hall although there is still 1 or 2 rows that can be formed in AC hall but they neglect it. Is it correct to form a row in Non AC hall when the Main hall has space