2）無(wu)需通(tong)風(feng)：雖然散谷(gu)會(hui)在(zai)途中下沉而(er)形(xing)成小(xiao)面(mian)(mian)積(ji)自由谷(gu)面(mian)(mian)，但這些小(xiao)小(xiao)面(mian)(mian)積(ji)與大(da)大(da)的(de)(de)谷(gu)物體積(ji)相比實(shi)在(zai)太少，龐大(da)體積(ji)貨物的(de)(de)熱量(liang)難(nan)以從微(wei) 小(xiao)面(mian)(mian)積(ji)的(de)(de)表面(mian)(mian)散發出(chu)去。但這僅(jin)僅(jin)是(shi)在(zai)無(wu)可奈何的(de)(de)情況下提出(chu)的(de)(de)“無(wu)需通(tong)風(feng)”。

3）通(tong)(tong)(tong)風(feng)有害：那(nei)么，潮濕(shi)的(de)散谷(gu)是否需通(tong)(tong)(tong)風(feng)呢？倘(tang)若散谷(gu)較潮濕(shi)，散谷(gu)最(zui)表(biao)(biao)層下面(mian)的(de)空(kong)隙中空(kong)氣(qi)又(you)熱(re)又(you)濕(shi)，艙(cang)外較冷的(de)新鮮空(kong)氣(qi)進(jin)入(ru)(ru)艙(cang)內，則水汽在表(biao)(biao)層散谷(gu)上(shang)凝(ning)結成(cheng)水珠，表(biao)(biao)層散谷(gu)就會發霉，甚至(zhi)結塊成(cheng)層。這層東西則會進(jin)一(yi)步封住下層散谷(gu)的(de)熱(re)與濕(shi)的(de)散發，故通(tong)(tong)(tong)風(feng)不能(neng)改善(shan)情況(kuang)，還(huan)可(ke)能(neng)有些害處。但并(bing)非說(shuo)絕對(dui)(dui)不該通(tong)(tong)(tong)風(feng)，當氣(qi)溫艙(cang)內高出(chu)艙(cang)外2.5℃以上(shang)而相對(dui)(dui)濕(shi)度艙(cang)內又(you)大大高于艙(cang)外，在氣(qi)象允許下是可(ke)通(tong)(tong)(tong)風(feng)的(de)，最(zui)好(hao)第一(yi)步是先緩(huan)慢地通(tong)(tong)(tong)風(feng)，如打開出(chu)入(ru)(ru)貨艙(cang)的(de)入(ru)(ru)孔蓋、入(ru)(ru)孔門與采用自(zi)然(ran)通(tong)(tong)(tong)風(feng)，然(ran)后再加快通(tong)(tong)(tong)風(feng)。