IMO, on a competitor, durring warm-up, the fan has to stay ON so long that it ignites far too many coals resulting in over-shot temps. Sometimes even though you are using a fuse or s-burn. Coals will still ignite on both sides of the metal.
MJH From Backyard Bomber BBQ ---- X 2 Junior & Stretch
22.5 Weber Kettle
Wine & Swine