SR PLENUM BOXES Characteristics: Rectangular SR or round SRR plenum boxes for diffusers and ventilation grilles, which ensure uniform air discharge via the supply or exhaust element Intended use The SR plenum boxes are connected to supply and exhaust diffusers. They are designed for low- and medium-pressure ventilation systems. The SR plenum boxes are made of galvanised metal sheet as standard. Upon request, they can be painted in any RAL colour or made of stainless steel. They can be equipped with either a top or side nipple connection pipe and can optionally be equipped with a damper. The SR plenum boxes can be delivered insulated. Upon request, they can be equipped with a screen deflector. Figure 1. Dimensions of a rectangular box with a side connection pipe. Figure 2. Dimensions of a rectangular box with a top connection pipe. As standard, the dimensions of connection pipes for rectangular boxes are selected according to the shorter side. For a 600 × 200 box the connection pipe dimension would be ø123. For NWM, NWMH, NWMR, NWMS, NSDZ and NTDZ diffusers, rectangular plenum boxes are used with a round branch duct under the diffuser front panel. For NS4, NS5, NS8 and NS9, square plenum boxes are used with a fold directed to the inside. For the grilles mounted with an assembling frame, square boxes are used with no folds. Plenum boxes Figure 3. Dimensions of the round box with a side connection pipe. Figure 4. Dimensions of the round box with a top connection pi

Table 1. Standard SR plenum box dimensions. Table 3. Using a mounting bracket for different installation methods. Boxes with different dimensions can be delivered on request. Table 2. Connection pipe lengths. Connection pipe diameter 0d [mm] Galvanised steel Stainless steel Diffuser type Installation Mounting method bracket Km NWM, NWMS, NWMH, NWMR NSDZ, NTDZ Manufacturing versions Figure 6. The box with no damper and with a deflector. Accessories Figure 10. Damper adjusted from the inside with a lever. Plenum boxes

Cost-effective version of a damper The economy version of the damper is distinguished from the standard version by the use of a different adjustment method (Fig. 11). Please note that when the cost-effective version of a damper is used, the structural resistance to multiple damper readjustments is lower. The damper is adjusted with a lever shown in fig. 13. Plenum boxes Figure 12. Damper adjustment from inside the box. Figure 13. Pe damper adjustment lever.

When ordering, please provide information in accordance with the following pattern: <TYP> <I> <W> - <C>x<D> - <oD> - <H> - <K> - <d><R> - <M> - <P> * Optional values - if not specified, default values will be used Plenum boxes