Gunzip all the files with a given extension in a different folder

I have a folder with 28 gz files with the extension .gz and 28 files with the extension .gz.bam. I would like to unzip all the 28 .gz files and send them to another folder. I was doing one by one as follows:

gunzip -c file1.gz > /mnt/s3/data_transfer/file1

How can I specify I want the .gz and not the .gz.bam?