Section 21Republic Act No. 6758, otherwise known as the Salary Standardization Law, and from other laws, rules and regulations on salaries and compensations; and to establish a Provident Fund and determine the , Sec./Art. 21

Open-end Mortgages. Notwithstanding any other provision of this Act, in connection with any mortgage guaranteed pursuant to any section of this Act which covers a property upon which there is located a dwelling designed for residential use, the corporation is authorized, upon such terms and conditions as it may prescribed, to guarantee the amount of such advances for the improvement or repair of the property made to the mortgagor pursuant to an "open-end" advances. Only advances for such improvements or repairs as will substantially protect or improve the basic liability or utility of the property involved shall be eligible for guaranty under section.

No such advances shall be guaranteed under this section if the amount thereof plus the amount of the unpaid balance of the original obligation of the mortgage would exceed the amount of such original principal obligation unless the mortgagor certifies that the proceeds of such advance be used to finance the construction of additional rooms or other enclosed space as part of dwelling. The guaranty of "open-end" advances shall not be taken into account in determining the aggregate amount of principal obligations of mortgages which may be guaranteed under this Act.