A separator assembly for removing dirt from an air flow in a suction cleaner, the separator assembly including: a first cyclone assembly including a first cyclone separator for separating coarse dirt from an air flow; and a second cyclone assembly including: a plurality of second cyclone separators arranged fluidly in parallel for separating fine dirt from an air flow, each providing a body (176a, 176b) with a cyclone inlet (160a, 160b) towards an upper end and a dirt outlet (172a, 172b) formed at a lower end; a lower sealing plate surrounding the lower ends of the second cyclone separators and configured such that the body of each second cyclone separator extends through a respective opening (130, 132) in the lower sealing plate, such that the dirt outlets of the second cyclone separators lie below the sealing plate, an upper sealing plate disposed adjacent the upper ends of the second cyclone separators, an intermediary chamber configured such that partially cleaned air is drawn into the intermediary chamber from the first cyclone assembly and subsequently into the inlets of the second cyclone separators, the upper end of the intermediary chamber being sealed by the upper sealing plate, and a securing member formed between and securable to each of the upper sealing plate and lower sealing plate, characterised in that either: the securing member provides a receiving portion and at least one of the upper and lower plates provides a securing arrangement (188, 190) configured for securement to the receiving portion; or the securing member is formed integrally with one of the lower sealing plate and upper sealing plate, and the other of the lower sealing plate and upper sealing plate provides the securing arrangement; or both the upper sealing plate and lower sealing plate each provides a securing arrangement and the securing member is formed as a separate component. a first cyclone assembly including a first cyclone separator for separating coarse dirt from an air flow; and a second cyclone assembly including: a plurality of second cyclone separators arranged fluidly in parallel for separating fine dirt from an air flow, each providing a body (176a, 176b) with a cyclone inlet (160a, 160b) towards an upper end and a dirt outlet (172a, 172b) formed at a lower end; a lower sealing plate surrounding the lower ends of the second cyclone separators and configured such that the body of each second cyclone separator extends through a respective opening (130, 132) in the lower sealing plate, such that the dirt outlets of the second cyclone separators lie below the sealing plate, an upper sealing plate disposed adjacent the upper ends of the second cyclone separators, an intermediary chamber configured such that partially cleaned air is drawn into the intermediary chamber from the first cyclone assembly and subsequently into the inlets of the second cyclone separators, the upper end of the intermediary chamber being sealed by the upper sealing plate, and a securing member formed between and securable to each of the upper sealing plate and lower sealing plate, a plurality of second cyclone separators arranged fluidly in parallel for separating fine dirt from an air flow, each providing a body (176a, 176b) with a cyclone inlet (160a, 160b) towards an upper end and a dirt outlet (172a, 172b) formed at a lower end; a lower sealing plate surrounding the lower ends of the second cyclone separators and configured such that the body of each second cyclone separator extends through a respective opening (130, 132) in the lower sealing plate, such that the dirt outlets of the second cyclone separators lie below the sealing plate, an upper sealing plate disposed adjacent the upper ends of the second cyclone separators, an intermediary chamber configured such that partially cleaned air is drawn into the intermediary chamber from the first cyclone assembly and subsequently into the inlets of the second cyclone separators, the upper end of the intermediary chamber being sealed by the upper sealing plate, and a securing member formed between and securable to each of the upper sealing plate and lower sealing plate, characterised in that either: the securing member provides a receiving portion and at least one of the upper and lower plates provides a securing arrangement (188, 190) configured for securement to the receiving portion; or the securing member is formed integrally with one of the lower sealing plate and upper sealing plate, and the other of the lower sealing plate and upper sealing plate provides the securing arrangement; or both the upper sealing plate and lower sealing plate each provides a securing arrangement and the securing member is formed as a separate component. the securing member provides a receiving portion and at least one of the upper and lower plates provides a securing arrangement (188, 190) configured for securement to the receiving portion; or the securing member is formed integrally with one of the lower sealing plate and upper sealing plate, and the other of the lower sealing plate and upper sealing plate provides the securing arrangement; or both the upper sealing plate and lower sealing plate each provides a securing arrangement and the securing member is formed as a separate component.