Description: This manual provides installation and operation instructions for laboratory freezers with preset temperature setpoints of -20ºC and -30ºC. Thermo Scientific Puffer Hubbard® Laboratory Fre...Description: This manual provides installation and operation instructions for laboratory freezers with preset temperature setpoints of -20ºC and -30ºC. Thermo Scientific Puffer Hubbard® Laboratory Freezers Attachment(s): File Last Modified 34830H72 - Rev B - Thermo Scientific Puffer Hubbard Laboratory Freezers - Installation and Operation Manual.pdf December 14, 2021 34830H72 - Rev A - Thermo Scientific Puffer Hubbard Laboratory Freezers - Installation and Operation Manual.pdf December 03, 2021