Pag-IBIG Fund has approved a P12-billion revolving credit line for the National Housing Authority (NHA), adequate to finance the development of 9,110 housing units, with an initial 6,967 homes to be built in Quezon City, Valenzuela, Zamboanga, and San Juan, as part of the government’s Pambansang Pabahay para sa Pilipino Housing, or 4PH Program, top officials announced Dec. 20.