Assertion: duct's entrance | /r/HasProperty | a pair of parallel sidewalls
Facets:
Source sentences:
text: 4 and the end view of duct assembly 40, central passage 50 may include an open entrance facing at least one fan 30, a front component wall 82, a pair of parallel sidewalls 64, a back wall 38 opposite the front component wall 82, and endwall 56 ( FIG. 3 ) closing a downstream end of central passage 50.