Follow the steps to fill out the form accurately and efficiently.

1. Click the ‘Get Form’ button to obtain the CSI Form 01-5C online. This will allow you to open the form in your preferred editing platform.
2. Begin by completing the 'Project' field. Specify the name of the project for which the substitution request is being made.
3. In the 'Substitution Request Number' field, enter a unique identifier for your substitution request to help with tracking.
4. Fill in the 'From' field with your name and the 'To' field with the name of the recipient or organization overseeing the project.
5. Insert the date on which you are submitting the request in the designated 'Date' field.
6. Provide the 'A/E Project Number', a reference number assigned to the architectural/engineering project.
7. In the 'Re' section, mention the contract or the specific details relating to the item for substitution.
8. Complete the 'Contract For' field with the name of the contract related to the project.
9. Specify the 'Specification Title' and 'Section' related to the product being substituted in the following fields.
10. In the 'Description' section, provide details regarding the product being substituted and the reasons for the request.
11. Identify the 'Proposed Substitution' by entering the manufacturer and trade name for the proposed product.
12. Fill in the 'Article/Paragraph' field to reference the specific section of the contract that the substitution will affect.
13. In the address, phone, and model number fields, provide accurate details for further communication.
14. Ensure that you attach all supporting data, including product descriptions and performance data, as stated in the form requirements.
15. Certify the undersigned declarations by checking each relevant statement regarding the proposed substitution.
16. Sign the form and include your firm name along with your contact details in the 'Submitted by' section.
17. Finally, review the entire form for accuracy, then save your changes and you can download, print, or share the completed form online.

Act now to complete your substitution request online and ensure efficient processing of your project needs.