| 摘要 |
<p>A structure is disclosed for straightening the air flow in the ducting downstream of the 5 impeller of an axial flow fan. The structure comprises a plurality of vanes (20) each of which comprises a blade (22) and a spigot (24). Each vane (22) has an axis and each has a drilled, blind, tapped bore in the spigot (24) thereof. Bolts passed through the ducting (16) are screwed into the bores of the spigots. This permits the vanes to be rotated about said their axes. 20- 20</p> |
