i agree with barry, i have a 60 and 46 size and you have to open up the bottom of the cowl(i would take at LEAST half of the bottom out) and more wont hurt and open up the front as muck as possible. and i also agree w/Barry on the coolpower 30, i just cant afford it, thats half the reason i put my 100 in the 46 and it runs great on 15% now ive removed even more of the bottom since this pic getting ready for summer, it was 105 yesterday and i flew with no heating probs.