that is the area of narrow end can be approximately 90 to 30 of the area of the wide end the removable grill 60 is disposed within the throat 50 the grill 60 is removably located relative to the housing 20 such as by removably connecting the grill to the throat 50 which is affixed to the housing or affixing the grill relative to the throat wherein the throat is removably attached to the housing the grill 60 or throat 50 can be removably connected by gravity or a retaining mechanism such as magnets detents snap fit threads or hook and loop fasteners in fig3 the grill 60 is located at or proximal to the bottom of the throat 50 thus the throat 50 and the grill 60 can be simultaneously removed cleaned and replaced however it is also contemplated the grill 60 can be operably located nearer the inlet of the throat 50 such that the grill and enmeshed threads can be removed from the throat the grill cleaned and replaced the grill 60 includes at least one and more preferably a plurality of slats or bars 62 extending across the area of the throat the slats 62 are selected to engage the threads entrained in a passing airflow therefore the slats 62 can have a cross section configured to enhance engagement with the threads the slats 62 can also have a relatively abrupt edge or leading edge to assist in retention of threads in one configuration the grill 60 has a mesh size between approximately 15 mm to 200 mm such that the threads accumulate on the grill.