Vaporizer® Bars are designed to prevent juices from building up, by causing them to spread out and evaporate faster. More of the flavour from the cooking juices finds its way back to the food instead of falling through to the drip tray, or building up and burning in a full flame.
A roasting hood makes it even better
By trapping the vapour inside an “outdoor oven”, the cooking vapour will fall back on the food on all sides, not just from underneath. The food stays moist while it’s cooking.