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in Germany: Technische Regeln Gasinstallation TRGI). Always comply with the currently valid regulations and installation instructions supplied by the gas appliance manufacturer. Only one side of the extractor hood may be installed next to a high-sided unit or high wall. Gap at least 300 mm. The installation of the extractor hood above gas cooking devices, at a minimum height of 650 mm – Fig. 1 – is permitted provided that the following nominal heat loads (Hs) are not exceeded: . Gas cookers Load of one hotplate Load of all hotplates Load of the oven max. max. max. 3.0 kW 8.3 kW 3.9 kW . Gas hobs Load of one hotplate Load of all hotplates max. max. 3.9 kW 11.3 kW . Gas ceramic hotplate The nominal heat load specifications do not apply to closed gas ceramic hobs. Always observe the specifications of the hob manufacturer. . Solid-fuel cookers The maximum nominal heat loads and the minimum distance are the same as for gas cookers. The extractor hood must not be installed over a solid fuel cooker – a potential fire hazard (e.g. flying sparks) – unless the cooker features a closed, non-removable cover and all national regulations are observed. The smaller the gap between the extractor hood and hotplates, the greater the likelihood that droplets will form on the underside of the extractor hood. Prior to installation Exhaust-air mode The exhaust air is discharged upwards through a ventilation shaft or directly through the outside wall into the open. DExhaust air must not be discharged via a smoke or exhaust gas flue which is already in use or via a shaft which is used for ventilating rooms in which fireplaces are located. Discharge exhaust air in accordance with official and statutory regulations (e.g. national building regulations). Discharge of air into smoke or exhaust air flues which are not in use requires the consent of a heating engineer. DIf the extractor hood is operated in exhaust-air mode at the same time as a flue-type heater (e.g. gas, oil or solid-fuel heater, instantaneous water heater, boiler), ensure that there is an adequate air supply which the heater requires for combustion. Safe operation is possible provided that the partial vacuum in the room in which the heater is installed does not exceed 4 Pa (0.04 mbar). This can be achieved if the combustion air is able to flow through non-lockable openings, e.g. in doors, windows and in conjunction with an air supply/air-intake wall box or by other technical procedures such as reciprocal interlocking. If the air intake is inadequate, there is a risk of poisoning from combustion gases which are drawn back into the room. An air-intake/exhaust-air wall box by itself is no guarantee that the limiting value will not be exceeded. Note: When assessing the overall requirement, the combined ventilation system for the entire household must be taken into consideration. This rule does not apply to the use of cooking appliances, such as hobs and gas cookers. The extractor hood can be used without restriction in circulating air mode – with an activated carbon filter. For exhaust air mode a one-way flap should be installed in the extractor hood unless already installed in the exhaust air pipe or wall box. If a one-way flap is not enclosed with the extractor hood, you purchase one from your dealer. If the exhaust air is conveyed through the outside wall, a telescopic wall box should be used. Before installation Optimum efficiency of the extractor hood: . Short, smooth exhaust pipe. . As few bends as possible. . Pipe diameter as large as possible (ideally 150 mm dia.) and wide pipe bends. If long, rough exhaust-air pipes, many pipe bends or smaller pipe diameters are used, the air extraction rate will no longer be at an optimum level and there will be an increase in noise. . Round pipes Short exhaust air pipe: inside diameter min. 120 mm, Longer exhaust air pipe: inside diameter min. 150 mm. . Flat ducts must have an inside cross-section equivalent to that of the round pipes. There should be no sharp bends. l120 mm dia. approx. 113 cm2 l150 mm dia. approx. 177 cm2 . If pipe diameters differ, insert sealing strip. . Ensure that there is an adequate air supply for exhaust air mode. Exhaust air directed backwards: Only possible inside tall wall cupboards depending on the size of the exhaust air pipe. . Make a hole in the rear panel of the wall cupboard, cutting out a notch for the power supply cable. Exhaust air directed upwards: 1. Make a hole in the top of the wall cupboard, cutting out a notch for the power supply cable. – template OI enclosed –. 2. If fitted, cut out the cupboard base to a min. depth of 270 mm over the entire width. Connecting a 150 mm exhaust pipe: . Attach the exhaust pipe directly to the air connector. Connection of 120 mm lexhaust air pipe: . Attach enclosed reducing connector to the air outlet. Holes in the air outlet must be sealed. . Attach exhaust air pipe to the reducing connector. Circulating-air mode . With activated carbon filt...
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