The near-wall flow characteristics and heat transfer in fan flows with and without triangular-plate turbulator, 45.degree. and 90.degree. angle of attack, mounted on a duct wall were experimentally investigated. Eight heated plates, placed along the bottom wall of the duct, were used as the heat transfer surfaces. The studies included three-component mean and fluctuating velocity measurements using laser Doppler velocimetry. Near-wall axial vorticities, turbulent kinetic energy and axial mean velocities were obtained from the measured velocity data. The temperatures on the heat transfer surfaces were measured using thermocouples to obtain the Stanton numbers. Results show that the triangular-plate turbulators in fan flows had the effect to cause the increases in the axial mean velocity, axial vorticity and turbulent kinetic energy, and to augment the heat transfer. The turbulent kinetic energy played the most important role in the heat transfer distribution.