Every time I hear someone mention added ductwork I remember John & Linda
Richardson's battery fire a few years ago: The batteries somehow caught
fire, causing a raging inferno under the right front hood. Someone had
added a duct which entered the cockpit just above Linda's feet. The flames
immediately burned through the duct, passed behind the dash and over her
head, then followed the roof toward the rear. They got out unharmed,
somehow, but despite a firetruck being nearby and putting the fire out
quickly, the coach was essentially destroyed above the beltline. That hole
through the firewall turned what might have been an underhood fire into a
total loss -- 'tho' he did buy it back and sell off all of the un-touched
running gear.

I won't have any added holes in my firewall!

Ken H.