A device 1, in which {TAIL ~ the element} permeable to the coolant is {HEAD ~ a grate} 
A device 1 , in which { TAIL ~ the element } permeable to the coolant is { HEAD ~ a grate }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD