A louvre offtake arrangement for a gas turbine engine comprises a first duct (52), where a primary flow (54) flows; a second duct (56), defining an offtake, connected to the first duct (52) at an inlet (58); and a plurality of louvres (64) arranged at the inlet (58). At least one louvre (64) protrudes from the second duct (56) into the first duct (52) to divert part of the primary flow (54) towards the second duct (56).
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