Free Area of a Top Hung Window

[RossThompson87]

Hi,

With an open top hung window, you achieve a rectangular opening at the base and two triangular openings at each side.

When establishing the free area of the window should the triangles be included for?

CIBSE AM10 seems to provide evidence either way. On Page 56 it suggests it should be in the

plane normal to the flow path

i.e. just the rectangle.

But on page 22, we have

With top hung vents, for example, the triangular opening each side of the open window is significant

suggesting these should be included.

Does anyone know the correct input IES is looking for?

Thanks

Ross

[golden eagle]

Ross,

I need to know the answer as well , I am wondering if you have already found out the answer of your question below ? if so would you please add here guidance or reference of it