Usually, the general contractor starts the process of sending RFIs.
Project managers record all communications about Requests for Information.
In engineering, the answers come to clients from the architect’s or engineer’s office.
Subcontractors can give RFI input with the help of the GC.
All decisions made as part of an RFI should be recorded in the project’s paperwork.

Read More : https://houseura.com/blog/what-is-rfi-in-construction/