53 Pa. Stat. § 373
Whenever any municipality authority shall have heretofore entered into any contract with the lowest responsible bidder for the construction of any school project or projects authorized by law, and the contract was awarded without having separate specifications and without receiving separate bids and awarding separate contracts for the heating and ventilating work as required by law, and the contract has been performed and the authority has received the benefits therefrom, if said contract does not evidence any fraud or conspiracy to violate the laws of the Commonwealth and neither the authority nor the school district or districts for whose benefit the project is constructed has suffered any pecuniary loss as the result of such failure to comply with the law, then such contract is hereby ratified and made valid to the same extent as if separate specifications had been prepared, separate bids received and separate contracts awarded for the heating and ventilating work.
53 P.S. § 373