Juan Dela Cruz constructed a windmill system for Pedro Santos for 100,000 with one year guaranty. Santos made a down payment of 50,000 and an down payment of 50,000 and an installment of 25,000,...

Juan Dela Cruz constructed a windmill system for Pedro Santos for 100,000 with one year guaranty. Santos made a down payment of 50,000 and an down payment of 50,000 and an installment of 25,000, leaving balance of 25,000.He refused to pay the balance because the windmill system collapsed after a strong wind hit the place. Is Dela Cruz exempt from liability due to fortuitous event?