Iowa Code § 715B.2
3. Language used in a certificate of authenticity or similar written instrument, stating that:
4. An express warranty and any disclaimer intended to negate or limit the warranty shall be construed wherever reasonable as consistent with each other but subject to the provisions of section 554.2202 on parol and extrinsic evidence. However, the negation or limitation is inoperative to the extent that the negation or limitation is unreasonable or that such construction is unreasonable. A negation or limitation is unreasonable if:
87 Acts, ch 49, §2