Marv and fellow listees: I am building an unpressurized L-IV and have a question regarding the installation of the aft cabin overhead blower. As you IV and ES builders know, the blower comes with the pressurized kit but not with our's. The question is: should I add this option; is it worth the cost, weight and complexity; does it add sufficient air and cooling to make a difference and where is the best place to install it? I would guess anyone out there who has operated a IV without AC but with a blower might be able to help me--all opinions are accepted! thanks, paul