Also provided are plates to form {HEAD ~ zigzag air passages} by blocking a space between {TAIL ~ the inner cover} and the outer cover 
Also provided are plates to form { HEAD ~ zigzag air passages } by blocking a space between { TAIL ~ the inner cover } and the outer cover
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH