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Figure 4. Seed drying cabinet at ECHO. The top chamber (A) contains a heat source. Air enters from the top chamber (intake not shown) and is directed by the fan, as indicated by the green arrows, into a channel on the right side of the cabinet that opens up at the bottom of the cabinet to allow the air to circulate around and through the screened shelves (B). An optional thermostat (C) turns the heat source off and on as needed to prevent overheating. Air also circulates back up to the top chamber as it passes through a dust filter (the blue strip of foam at the bottom of the top chamber). It is possible to incorporate a valve or diverter into the air intake to control how much air is exhausted (to re-move humidity) versus recirculated (to warm the air). Source: ECHO staff.