Merriway BH05804 9 x 6 inch Adjustable Sliding Hit and Miss Air Grille (Overall Vent Size: 240 x 165mm), Aluminium, White, 180 x 110 mm, 240 x 165 mm

Seems like an OK vent. It's well made but the corners were a little bent on arrival and needed to be straightened. Be aware though that the sizes given in inches are not correct. It is 9.5" by 6.5", not the 9x6 stated. The metric measurements are correct though.