extractors

Hello. Was wondering if anyone can help. Just had bathroom done and the fitter installed an inline Osily extractor which, quite frankly, is useless! So I've replaced it with a Manrose MF100T which is far better. However, the Osily has a N, L and LT connection. The Manrose has a N, L and LS...

Hi I have installed one inline extractor fan above a first floor bathroom shower. The unit is in the loft. It is not as strong as I would like and want to know whether I could add a second incline fan to increase the suction either using a couple of Y connectors (so both fans are sucking the...