the perimeter 15 of the hood 11 providing a substantially planar opening 14 will allow for the cutting elements 19 to be maintained at a height no less than the height x between the perimeter and the distance that the cutting elements 19 are positioned within the enclosure 12 from the perimeter 15 of the hood 11 accordingly there is a minimum height that is provided as cutting of the grass occurs by the lawn trimmer attachment unit 1 of the present invention accordingly the perimeter 15 of the hood 11 provides a height gauge between the ground and the blades 19 in order to prevent the blades from gauging the grass the hood 11 is preferably in plan view of a circular perimeter shape in the preferred form the fan 20 which is mounted from the rotary shaft 16 is driven by the motor 3 in an alternative form the fan 20 may be driven by a second motor independent from the motor 3 further in the preferred form the fan 20 and the blades 19 are of a single unit as depicted in fig1 in an alternative form as depicts in fig9 the fan 20 and the blades 19 can be of two separate units both mounted from said rotary shaft 16 it is appreciated that both the fan.