{HEAD ~ a ring shaped pan} having {TAIL ~ the vents} about a perimeter edge of the pan positioned about the large open end of the recessed can, the vents for allowing the incoming air to pass into the housing through the motor run blower 
having
{ HEAD ~ a ring shaped pan } having { TAIL ~ the vents } about a perimeter edge of the pan positioned about the large open end of the recessed can , the vents for allowing the incoming air to pass into the housing through the motor run blower
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