The costs of engineering are a normal overhead item included with the price. JFD will design, size, and price heat exchangers with (1) set of operating/process conditions, and a maximum of (1) alternate material selection set. Effective July 1st, 2005, where other engineering services are required, the additional cost is based on comparable fees charged by consulting engineers on a competitive basis. The cost of said engineering may, by mutual agreement between J.F.D. Tube & Coil Products, Inc. and the customer, be wholly or partially credited toward the purchase price of relevant product orders placed with J.F.D.