All-fresh-air　heating,　ventilation,　and　air　conditioning　systems　with　high　air　exchange　rates　are　typically　applied　in　conventional　laboratory　animal　houses　(LAHs),　resulting　in　high　energy　consumptions　for　fresh　air　handling.　Therefore,　exhaust　air　heat　recovery　(EAHR)　systems　are　widely　used　for　energy　saving.　In　this　study,　a　novel　air-to-air　heat　recovery　unit　was　proposed　based　on　flat　micro-heat　pipe　array　technology　and　finned　micro-heat　pipe　integration　technique.　This　was　used　to　recover　waste　heat　from　the　exhaust　air　in　a　conventional　LAH　in　Beijing.　The　heat　recovery　performance　was　experimentally　and　numerically　investigated.　The　results　show　that　the　maximum　heat　recovery　capacity,　heat　recovery　efficiency,　and　of　performance　are　39.0　kW,　83.6%,　and　17.8,　respectively,　in　winter,　and　are　21.1　kW,　81.6%,　and　9.6,　respectively,　in　the　transition　season.　The　heat　recovery　capacity　and　efficiency　decrease　from　44.3　to　3.3　kW　and　from　83.4%　to　63.0%,　respectively,　when　fresh　air　temperature　increases　from　-7　to　22　degrees　C.　When　the　air　velocity　increases　from　1.0　to　3.0　m/s,　the　reduction　of　the　heat　recovery　efficiency　is　approximately　4%,　and　the　pressure　loss　increases　from　36.9　to　159.6　Pa.　Overall,　the　EAHR　unit　shows　better　performance　than　traditional　units.