I really don`t understand why exhaust diversion isn`t a standard. All you would need is a clip and 6" of hose to run back up the air inlet hose. It doesn`t seem like that big of a step to take in regulator "technology." Maybe consumers haven`t been talking to manufactures or manufactures haven`t been listening to consumers. What I believe is that whatever manufacturer starts this trend is going to run away with the profits until the rest catch up. PEACE D