The Reserve Bank of India today announced that lines of credit amounting to Rs 9,000 crore would be extended to National Housing Bank (NHB) and Exim Bank to stimulate the housing and export sectors. RBI Governor D Subbarao told reporters after the bank's central board meeting here that refinance facility of an amount of Rs 4,000 crore would be given to NHB, while Rs 5,000 crore facility would be extended to Exim Bank at the prevailing repo rate.