A filtration module and a method of installing a filtration module

A filtration module for filtrating a fluid feed into a retentate portion and a permeate portion, the filtration module being substantially cylindrical and extending in a longitudinal direction between a first end and a second end, the first end and the second end being substantially circular, the filtration module comprising:

• a permeate tube extending substantially between the first end and the second end, the permeate tube defining a plurality of perforations,
• a membrane filtration element extending substantially between the first end and the second end and being spirally wound around the permeate tube, the membrane filtration element being in fluid communication with at least one of the perforations,
• a wrap surrounding the wound membrane filtration element and extending substantially between the first end and the second end, the wrap defining an outer surface, the outer surface defining a circumferential direction being substantially perpendicular to the longitudinal direction, and
• a flap for being positioned onto and covering at least a part of the outer surface of the wrap, the wrap and the flap both being made of a fluid permeable polymeric grid material having ribs extending in the circumferential direction, wherein the ribs of the wrap define a first spacing between themselves and the ribs of the flap define a second spacing between themselves, the first spacing being different than the second spacing, the ribs of the wrap and the ribs of the flap are facing each other.