air intake ports 25 then into the blower 24 and the blower intake port 22 the blower blades 20 rotate centrifugally to cause a differential pressure thereby urging the air to flow to a blower exhaust chamber 26 of the blower 24 the air then is forced through ports 28 in the first end plate 10 into the channels 30 shown in fig3 formed between cooling fins 5 b the present invention includes air entrainment walls 6 which force the air fully through the length of the channels 30 created by the fins 5 b to finally exiting from the power tool 1 to the atmosphere through ports 35 fig3 shows a cross section of the motor 2 and motor and controller housing 5 with the air entrainment walls 6 the air entrainment walls 6 are retained by portions of the motor and controller housing 5 shown as 5 a and 5 d the motor and controller housing 5 has longitudinal fins 5 c and 5 b representing many fins over its entire length fin 5 c is shown to be longer than fin 5 b the walls 6 are manufactured as flat planar pieces when the walls 6 are inserted.