| http://www.w3.org/ns/prov#value | - Alternative support structures for heater 12 are contemplated by the present invention, such as a lip extending partially about the inner circumference of the lower housing half 16. [0029] With reference to FIG. 2, when assembled, the flat heater 12 divides space inside the assembled housing halves 14, 16 into an upper air passageway or air plenum 17 and a lower air passageway or air plenum 19 cou
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