A/c supercharging
 

1988 911 Carrera Special Edition.
http://forums.pelicanparts.com/uploa...1399146053.jpg
Engine idle airflow.
http://forums.pelicanparts.com/uploa...1399146141.jpg
Lift heat lever ever so slightly.
http://forums.pelicanparts.com/uploa...1399146235.jpg
Footwell blower "boost"
http://forums.pelicanparts.com/uploa...1399146285.jpg
Engine idling
http://forums.pelicanparts.com/uploa...1399146370.jpg
"derated" (***) factory squirrel cage blower.
http://forums.pelicanparts.com/uploa...1399146451.jpg

I remembered that the blower in my 1978 was "derated", squirrel cage blower wheel displaced to allow engine fan forced airflow bypass.
Same here....Makes one wonder if that 163 FPM airflow rate might go over 200FPM with a "proper/standard" blower design.

http://www.pelicanparts.com/techarticles/911_extra_cooling/911_extra_cooling.htm