stimating the cost of the equipment allows you to calculate the budget correctly. Estimates are also required for conducting a state examination, therefore, at the N stage in this case, the project documentation must contain an accurate specification. At the stage of the budget assessment, equipment is selected from suppliers, a commercial proposal is requested, or a technical and commercial proposal. Before the equipment selection stage, the brand list is coordinated with the customer. It is important to complete the detailed specification, filled out in accordance with GOST, to include shaped parts and fittings that fully reflect information about the purchased material and the work performed. Examples of Ventilation Equipment suppliers: Korf Ned Military-technical cooperation Systemair The Arctic Rowan LG