The green plastic grill (water intake screen a-la-storm drain) is part of a system I devised to pick up the cold air off the floor and pipe it up to the heater in order to avoid stratification or layering of the heat in the cabin. Force 10 wants you to mount the heater closer to the floor than the counter top, but in the CD-22 Cruiser, all the floor space is pretty much dedicated. With the heater at counter top level, a method of mixing up the cabin air is needed. Air is taken in here at the center lowest point in the boat and transfered up to the heater via two small computer power supply fan motors that draw only 0.12 amps each or a total of 2.4 amp-hours for a 10 hour run for both. Hardly taxes a 90 amp-hour battery! The propane alarm can be seen at the left.
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