This graduate thesis includes the CAD / CAM modeling of the ventilation system at the public discourse of the Spectrum of the Seas. The Spectrum of the Seas will be built at the Meyer Werft Shipyard, Papenburg, Germany in 2019. The ventilation system is modeled at TSI d.o.o. (Technical Services Inc.) which acts as a design sub-contractor for the Meyer Werft shipyard. The work includes completing the technical documentation which is derived from the model of the ventilation system. The subject drawings and documentation analyzed in this masters of engineering thesis is the property of the company. The selected space is located on the 15th deck and 2 fireplaces of the subject cruise passenger vessel. The ventilation system includes supply, drainage and circulating air ducts. In this paper, all the shipyard standards needed to create a ventilation model have been described and elaborated in detail.Likewise, the dimension of the channel dimension, the flow rate with the required air flows for each space is made in Microsoft Office Excel 2007. According to the ventilation duct scheme, the ventilation system model is createdusing the CATIAV4 program and all technical documentation is described and available in thegraduate thesis