Centrifugal fan arrangement

A centrifugal fan arrangement (1) comprising:

• a centrifugal fan (2) rotatably mounted within a scroll housing (3), wherein said centrifugal fan comprises a plurality of circumferentially spaced fan blades fixed to a central fan axle extending along an axial direction (A) and/or to a circumferential fan ring extending in a plane orthogonal to the axial direction (A), wherein said scroll housing (3) comprises a housing main portion (3b) with a maximum housing diameter D and a maximum axial housing width H, a housing inlet portion (3a) and a housing outlet portion (3c), said housing main portion (3b) surrounding said centrifugal fan (2) at radially outer locations to define a circumferentially extending air guiding space (GS), said housing inlet portion (3a) being located at radially inner locations to define an inner air inlet space (1S), and said housing outlet portion (3c) being located at a radially outer location in order to define an air outlet space (OS),
• wherein the centrifugal fan arrangement (1) comprises a first pressure sensor (PS1) for measuring air pressure within and/or outside said centrifugal fan arrangement (1), wherein the first pressure sensor comprises a ring duct (7) with circumferentially spaced holes in fluid connection with the pressure sensor (PS1) and circumferentially extending along an inner wall of a duct portion for spatially averaged air pressure movement,
• wherein said first pressure sensor (PS1) is located outside the duct portion of said centrifugal fan arrangement, wherein said circumferentially spaced holes and said first pressure sensor (PS1) are connected by pressure sensor air duct portions (11, 12) located outside said duct portion of said centrifugal fan arrangement, and
• wherein said pressure sensor air duct portions (11, 12) located outside said duct portion of said centrifugal fan arrangement (1) comprise a junction (14) where a first pressure sensor air duct portion (11) connected to a first hole of said circumferentially spaced holes, a second pressure sensor air duct portion (12) connected to a second hole of said circumferentially spaced holes and a third pressure sensor air duct portion (13) connected to said first pressure sensor (PS1) are all fluidly connected to each other, wherein the third pressure sensor air duct portion (13) extends away from the junction in the axial direction (A).