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BDv2.0. Note UV ozone generator's outlet in the dryer's exhaust air stream.
Heating element detail. That's not 2 fans in series- the fan body next to the heat sink has had its (blown) motor cut out. The fan body is used to space the fan blades away from the heat sink fins- makes a hell of a whzzzzzzzzzzzzzing sound if the blades pass within a couple mm of the heatsink fins. Nylon stocking material used as intake air filter.
heatsink is warmed by 6x 25W power resistors in parallel, temp controlled with a 500W incandescent light dimmer.
overhead view of heating element
side view showing thermostat and 2nd thermometer (for verifying the temp reading on the thermostat). Knob below tstat is the dimmer for setting voltage applied to resistors.
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intake fan. Note temp sensors, white one is for the backup thermometer, the tiny blue one on the bottom is the thermistor from the thermosat unit, which has been removed from the tstat and remote mounted in the warm airstream.