Draught diverter

In premises equipped with direct external exhaust it has to be determined in advance if the connection to the exhaust duct will be fixed or achieved by means of a so called draught diverter (Fig 27.3). 

When a so called draught diverter is implemented the exhaust channel is placed over the outlet of the equipment like an inverted funnel. At switched-off status, air will be sucked out from the room, bypassing the equipment. When switched-on the air leaves the room mainly through the equipment. Accounting for the volume of air that passes through the equipment is necessary in the calculation of the air balance. For the air pressure or ventilation factor in the room it doesn t matter whether the equipment is switched on or off. 

In any case it should be warranted, whether the equipment is fitted with a draught diverter or with a... 

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