The air handling unit casing consists of closed aluminum profi les connected by strong corner fasteners made of aluminum alloy or high-strength fi berglass-reinforced special plastic and three-layer panels with an internal fi ller of dense mineral wool. The panel thickness is 50 mm. For the manufacture of panel walls, a galvanized sheet with a thickness of 0.7 mm is used. Design version 01 comes with powder coating on external and internal panels as standard. In design version 03, external and internal panels manufactured without additional coating.

When designing VRS-550 air conditioners with a built-in automatic control system, the possibility of a traditional approach and an individual order development procedure based on blockmodular construction of air conditioners from an arbitrary set of functional modules is preserved. The block-modular design of VRS-550 air conditioners, combined with the block-modular standardized design of the automatic control system, provides high design fl exibility with minimal labor and time investment.