a compartment accessible from an exterior wall of said housing through a closeable access opening and {TAIL ~ communicating} with {HEAD ~ said sealable chamber}, said compartment configured to receive a reducing agent, at least a portion of said compartment being disposed below said plate, and said plate and said floor cooperating to prevent solid particulate from entering said chamber from said compartment 
a compartment accessible from an exterior wall of said housing through a closeable access opening and { TAIL ~ communicating } with { HEAD ~ said sealable chamber } , said compartment configured to receive a reducing agent , at least a portion of said compartment being disposed below said plate , and said plate and said floor cooperating to prevent solid particulate from entering said chamber from said compartment
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