Ohio Revised Code Title XXXIX. Insurance § 3937.26

(A) An insurer may refuse to renew a policy of commercial property insurance, commercial fire insurance, or commercial casualty insurance other than fidelity or surety bonds, medical malpractice insurance, and automobile insurance as defined in section 3937.30 of the Revised Code, by mailing to the insured, at the insured's last known address, at least thirty days prior to the date of the expiration date of the policy, a notice of the insurer's intention not to renew the policy.

Such notice shall contain all of the following:

(B) If the notice of nonrenewal is mailed less than thirty days before the expiration date of the policy, the insured's coverage then in effect remains in effect until thirty days after the date of mailing the notice, unless the insured notifies the insurer in writing that the insured accepts the nonrenewal as stated. The insurer shall notify the insured of the amount of the premium for the time after the expiration date that the coverage may remain in effect, and the insured shall pay such premium unless the insured accepts the stated nonrenewal. The premium must be calculated using the rates originally applicable to the insured's coverage then in effect.