An exterior vent-louvre assembly (10) comprising: at least two vertically spaced-apart exterior vent-louvre members (12) which define an exterior air-flow path (16) having a substantially uniform lateral extent there between. There is an under-surface (26)of a leading intermediate part (28) of each louvre member having a first lower active-surface portion (30); and an under-surface (26) of a trailing intermediate part (58) of each louvre member having a second lower active- surface portion (64); an upper-surface of a crown part (22) of each louvre member including an unbroken transition (66) to the trailing intermediate part (58) and having an upper active-surface portion (52). A first distance D1 from a leading-edge region (54) of the upper active-surface portion (52) of each vent louvre member to the first lower active-surface portion (30) of an above and adjacent vent-louvre member matches or substantially matches a second distance (D2) from a trailing-edge region (56) of the upper active-surface portion (52) of said vent-louvre member to the second lower active-surface portion 64 of the said above and adjacent vent louvre member, whereby the matching or substantially matching said first and second distances (D1, D2) prevent or reduce air-flow turbulence at or downstream of the crown part (22) to improve entrained moisture removal.
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