Example implementations provide a sealing assembly to a seal an aperture, coupling two chambers, the aperture being arranged to accommodate a printhead carriage; the assembly comprising: at least one curtain capable of being disposed in a sealing relationship with the aperture; the at least one curtain being capable of being positioned either side of the printhead carriage, and at least one biasing arrangement to bias the at least one curtain into a biased state; the biased state comprising a component orthogonal to a longitudinal length of the at least one curtain.