In addition amps use fins to dissipate the heat so airflow isn't really needed as much as airspace. Like Crutchfield advises as long as there is a few inches of space around them the amp will be fine. I know this from being a computer geek, nerd, whatever, I built mine. There's enough air movement in a car, even without A/C or windows open, to keep the heat moving away from the amp(s) under seats.