{"product_id":"unterdruck-sicherheits-abschalter-usa","title":"Vacuum safety cut-off switch USA-4","description":"\u003cp\u003eWhy does a chimney \"draw the wrong way round\"? A kitchen extractor hood or a toilet fan can draw exhaust gases out of the chimney into the living space. This must not happen and must be prevented. People must not be put at risk.\u003c\/p\u003e\n\u003cp\u003eThe Ordinance on Combustion Installations (FeuV § 4, Installation of Combustion Appliances) stipulates that when a room-air-dependent combustion appliance (e.g. fireplace, wood-burning stove, gas boiler) and an exhaust air fan (e.g. extractor hood) are operated simultaneously in a dwelling\/house, it must be ensured that no carbon monoxide is drawn out of the combustion appliance.\u003c\/p\u003e\n\u003cp\u003eThe negative pressure safety cut-off switch continuously measures the differential pressure between the room and the chimney. If the chimney draws \"the wrong way round,\" the extractor hood or ventilation system is switched off for safety reasons. The USA (negative pressure safety cut-off switch) is only \"armed\" once the fire is burning. Otherwise, the system remains on \"standby.\"\u003c\/p\u003e\n\u003cp\u003eAn electronic component, flush-mounted, is installed in the immediate vicinity of the stove.\u003c\/p\u003e\n\u003cp\u003eA precise negative pressure sensor monitors the differential pressure between the chimney and the room. If the negative pressure rises above 4 Pascal, for example due to the use of a bathroom fan, the fan system is switched off for your safety.\u003c\/p\u003e\n\u003cp\u003eDraught fluctuations caused by gusts of wind are not taken into account and are filtered out by the electronics.\u003c\/p\u003e\n\u003cp\u003eThe USA naturally holds official approval from the German Institute for Building Technology (Deutsches Institut für Bautechnik).\u003c\/p\u003e\n\u003cp\u003eThe connection must be carried out by a qualified electrician, in accordance with the enclosed instructions.\u003c\/p\u003e\n\u003cp\u003eScope of delivery:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eUSA control unit with attractive glass display\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eFlue gas sensor connection\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eNegative pressure hose (5 m)\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eConnecting cable (5 m)\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eFlush-mounted box\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eEscutcheon\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eManufacturer: BRUNNER\u003c\/p\u003e","brand":"Kamin-Laden","offers":[{"title":"Default Title","offer_id":46710082732369,"sku":"KL10318","price":1389.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0758\/7584\/4433\/products\/usa-display.jpg?v=1685376247","url":"https:\/\/nordickrog.com\/en\/products\/negative-pressure-safety-switch-usa","provider":"Kaminladen","version":"1.0","type":"link"}