Home / Standards / GB/T 21087-2007 GB/T 21087-2007 Abolished Air-to-Air energy recovery equipment 空气-空气能量回收装置 Standard Type GBT ICS 91.140.30 CCS P46 Status 废止 Issue Date 2007-09-11 Implementation 2008-02-01 Responsible Dept 住房城乡建设部 Drafting Unit N/A