I can tell you getting the suitcase sealed to the firewall is a royal pain. I thought I put a fair amount of sealant on the case before bolting it on. When I hooked up the fan to test it, I had numerous small leaks. After 90 minutes, I was able to get it all sealed up and sucked the fresh air vent closed and tested it. Huge difference in air flow in the cock pit. I could put my hand even with or behind the head rest and I could feel air flow from the side vents.
When I pull the dash and check the seals on the interior portion, it should be more than acceptable for a part time driver.
I tried the PM 136 fan and the blade was 1/2 to 3/4 too short compared to the original. I didn't think it would seal tight enough to the firewall so I didn't even test it.
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