... it according the customer mind or the drawings D type series air cooler is a kind of cooling equipment ... of preserved food.There are 3 range temp. DL type of high temperature, fin space 4.5mm, is ... fresh food such as vegetables, fruits and eggs; DD type of moderate temperature, fin space 6.0mm, for cold ... keeping food such as meat and aquatic products; DJ type of low temperature, fin space 9.0mm, for -2 ...