How to Set a Steel Door Frame in Block Wall

Romtec Inc and LS Construction demonstrate the steps it takes to properly set a steel door frame in CMU block construction.
Romtec designs, manufactures, supplies, and constructs buildings and structures for all types of applications. We are architects, engineers, manufacturers, and contractors. Our process begins by designing a building that is particular to the needs of each customer. Then, Romtec provides the complete building plan sets and specifications for customer approval. Each project can then be sent out to bid or purchased directly. Finally, Romtec manufactures and supplies the complete building to be constructed by the contractor or by Romtec as a “turnkey” project.
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Can this be done on a older house? Should u purchase a smaller frame so I can put cement into it?