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Hello,
Looking at this manual from Manitowoc: http://www.manitowoc.com.cn/down/UploadFiles/S420.pdf
Manitowoc Ice 3005939 AIR FILTER | Parts Town
This appears to be the part you need, # 3005939
I believe the S420 itself is actually the designation for an ice storage bin, as per this information: http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/MAN-S-Series_pm.pdf
and that the ice machine models which work with this ice bin are:
