{"product_id":"100mm-extractor-fan-with-overrun-timer-black","title":"100mm Extractor Fan With Overrun Timer - Black","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Knightsbridge EX1TBK is a 100mm (4-inch) extractor fan in black ABS with an adjustable overrun timer preset to 2 minutes and an adjustable range of 2-30 minutes. Rated at 24 l\/s (87m³\/hr) extraction, it operates at 28.5-30dBA at 3 metres, making it one of the quieter options for bathroom, ensuite and utility ventilation where continuous operation or post-shower moisture extraction is needed without intrusive noise.\u003c\/p\u003e\n\u003cp\u003eDesigned for wall and ceiling installation in Zone 1 (IP45 rating), the fan fits a 102mm cut-out and has a 49.9mm projection from the wall once fitted, with 78.5mm recessed depth behind the mounting surface. The built-in back draft shutter closes when the fan is off, reducing cold air ingress through short ducting runs. The overrun timer continues to extract after the light or pull-cord switch is turned off, clearing residual moisture without needing to leave the switch on manually.\u003c\/p\u003e\n\u003cp\u003eThe black finish provides a low-visibility alternative to white in dark-tiled bathrooms, utility rooms and commercial washrooms. The ABS construction is double-insulated (Class II), so no earth terminal is required during installation. The fan complies with Building Regulations Part F (ventilation rates) and Part L (energy efficiency) at 0.404W\/l\/s SFP, making it a compliant choice for new-build and retrofit projects requiring certified extraction.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e157.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e157.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth\u003c\/td\u003e\n\u003ctd\u003e127.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProjection\u003c\/td\u003e\n\u003ctd\u003e49.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecessed Depth\u003c\/td\u003e\n\u003ctd\u003e78.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-out Diameter\u003c\/td\u003e\n\u003ctd\u003e102mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eABS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIP Rating\u003c\/td\u003e\n\u003ctd\u003eIP45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClass\u003c\/td\u003e\n\u003ctd\u003eII\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e230V 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEarth Terminal\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise Levels\u003c\/td\u003e\n\u003ctd\u003e28.5 - 30dB @ 3m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAirflow\u003c\/td\u003e\n\u003ctd\u003eAirflow: 24l\/s [86.93m3\/hr]\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSFP\u003c\/td\u003e\n\u003ctd\u003e0.401W \/ (l\/s)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverrun Timer\u003c\/td\u003e\n\u003ctd\u003eOverrun timer settings: 2-30mins (Preset: 2mins)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e3 Year Guarantee\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/datasheet-EX1TBK.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the overrun timer work?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fan connects to a switched live (typically the bathroom light switch or a separate pull-cord). When the switch is turned on, the fan runs immediately. When the switch is turned off, the timer keeps the fan running for a preset period (default 2 minutes, adjustable 2-30 minutes) before it stops. This clears residual moisture without needing to leave the switch on manually.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for use in a bathroom shower area?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The IP45 rating allows installation in Zone 1 (directly above a bath or shower enclosure), provided the fan is installed according to wiring regulations and at the correct mounting height. It is not suitable for Zone 0 (inside a shower cubicle or bath).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow quiet is it in practice?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAt 28.5-30dBA at 3 metres, the EX1TBK is quieter than most extractor fans in the 100mm class, which typically run at 35-40dBA. In a typical domestic bathroom, the noise is comparable to a quiet refrigerator hum rather than the louder whirr of standard extraction fans.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it need to be earthed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The fan is double-insulated (Class II), so it does not require an earth terminal. You need only a permanent live, a switched live (for the overrun timer control), and a neutral connection.\u003c\/p\u003e","brand":"Knightsbridge","offers":[{"title":"Default Title","offer_id":51391622283531,"sku":"EX1TBK","price":39.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/1949350_ed854acd-c6b8-42dc-ada5-1af2df8d9047.jpg?v=1747062728","url":"https:\/\/niori.co.uk\/products\/100mm-extractor-fan-with-overrun-timer-black","provider":"Niori","version":"1.0","type":"link"}