Apparatus comprising: melt-blowing equipment for generating fibres of plastics material entrained in a gas stream, the melt-blowing equipment comprising a die head having an outlet from which fibres entrained in a gas stream emerge from the melt-blowing equipment, and equipment to receive the fibres entrained in a gas stream emerging from the die-head of the melt-blowing equipment, and for gathering said fibres, wherein the equipment for receiving and gathering said fibres entrained in a gas stream comprises an enclosure having an inlet through which the fibres entrained in a gas stream are directed into a primary passage within the enclosure, a fibre outlet from which gathered fibres are withdrawn from the enclosure, and an exhaust outlet through which the entrained gas separated from the gathered fibres in the primary passage passes out of the enclosure, the enclosure being constructed to provide a pathway for the fibres through the enclosure from the inlet to the fibre outlet, wherein the melt-blowing equipment and the equipment to receive the fibres entrained in a gas stream and to gather the fibres is spaced such that a first portion of surplus gas in which the fibres are entrained is separated from said entrained fibres as said entrained fibres are directed to the inlet of the enclosure and before the fibres entrained in said gas stream enter the enclosure, said first portion of surplus gas being exhausted to atmosphere outside of the enclosure, characterised in that the enclosure comprises a baffle extending in the direction of the gas stream and the pathway for the fibres and which defines an auxiliary passage (49a,49b) alongside the primary passage within the enclosure, the baffle being arranged to direct fibres entrained in the gas stream into the inlet of the primary passage, and a second portion of surplus gas from a periphery of the gas stream into said auxiliary passage (49a,49b) as said entrained fibres are directed to the inlet, wherein said exhaust outlet includes an outlet from the auxiliary passage (49a, 49b) to exhaust said second portion of surplus gas to atmosphere outside of the enclosure. melt-blowing equipment for generating fibres of plastics material entrained in a gas stream, the melt-blowing equipment comprising a die head having an outlet from which fibres entrained in a gas stream emerge from the melt-blowing equipment, and equipment to receive the fibres entrained in a gas stream emerging from the die-head of the melt-blowing equipment, and for gathering said fibres, wherein the equipment for receiving and gathering said fibres entrained in a gas stream comprises an enclosure having an inlet through which the fibres entrained in a gas stream are directed into a primary passage within the enclosure, a fibre outlet from which gathered fibres are withdrawn from the enclosure, and an exhaust outlet through which the entrained gas separated from the gathered fibres in the primary passage passes out of the enclosure, the enclosure being constructed to provide a pathway for the fibres through the enclosure from the inlet to the fibre outlet, wherein the melt-blowing equipment and the equipment to receive the fibres entrained in a gas stream and to gather the fibres is spaced such that a first portion of surplus gas in which the fibres are entrained is separated from said entrained fibres as said entrained fibres are directed to the inlet of the enclosure and before the fibres entrained in said gas stream enter the enclosure, said first portion of surplus gas being exhausted to atmosphere outside of the enclosure, characterised in that the enclosure comprises a baffle extending in the direction of the gas stream and the pathway for the fibres and which defines an auxiliary passage (49a,49b) alongside the primary passage within the enclosure, the baffle being arranged to direct fibres entrained in the gas stream into the inlet of the primary passage, and a second portion of surplus gas from a periphery of the gas stream into said auxiliary passage (49a,49b) as said entrained fibres are directed to the inlet, wherein said exhaust outlet includes an outlet from the auxiliary passage (49a, 49b) to exhaust said second portion of surplus gas to atmosphere outside of the enclosure.