MW31 – Malico Inc. Home » Passive Heat Sink » MW Series » MW31 – Malico Inc. :: MW31 :: Dimension Model No. L x W (mm) Height (mm) Weight (grams) CAD MW 31-12 31 x 31 11.6 10.4 By request MW 31-15 31 x 31 14.6 11.7 By request MW 31-18 31 x 31 17.6 13.0 By request MW 31-21 31 x 31 20.6 14.4 By request MW 31-23 31 x 31 22.6 15.1 By request MW 31-28 31 x 31 27.6 17.5 By request MW 31-33 31 x 31 32.6 19.7 By request Material : Aluminum 6063 Finish : Black anodize Remarks : Model number MW31-12 indicate 31x31mm is package footprint and 12 mm is overall height , all the dimensions are in arithmetic , the drawing overall height is real dimension :: Rth ( oC/W ) :: Air Velocity / Rth ( oC/W ) 200(LFM) 400(LFM) 600(LFM) MW 31-12 3.37 2.25 1.87 MW 31-15 3.13 2.02 1.66 MW 31-18 2.85 1.79 1.45 MW 31-21 2.63 1.63 1.31 MW 31-23 2.44 1.50 1.19 MW 31-28 2.21 1.36 1.05 MW 31-33 2.02 1.19 0.93