| The cabin air system so far is very simple. It only consists of an outside air filter and fan mounted on the bottom tub, connected to the windscreen air plenumn. I don't have any source installed yet for cabin heat, and no vent controls other than the fan motor switch.
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I cut a 5" x 6.5" hole in the bottom tub for the outside air inlet and cabin air fan, in the area just forward of the passenger seat behind the cyclic.
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The hole is reinforced with an aluminum frame epoxied and fiberglassed to the tub.
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The frame is sized for a small Fram CA3916 ExtraGuard pleated air filter, which is formed with a soft gasket and an expanded aluminum screen on the bottom side.
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The air filter fits down inside the aluminum frame and seals against the inside of the tub.
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The cabin air fan is a 12V 4.4A 105 cfm Jabsco Blower #35115-0020, with a 2" SCAT duct flange glued to the 3" flange on the fan. The fan is glued to a light aluminum box that sits above the air filter.
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A spring tab on each side of the aluminum frame clamps the fan box down tight against the filter gasket. If I ever figure out a cabin heat source, perhaps I'll connect it and mix the hot/cool air in the filter box here.
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A 4' length of 2" SCAT hose connects the fan to the front windscreen air plenum.
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Last Updated: March 29, 2014
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