vacuum wiper hoses

I'm finishing up details on a '59 Apache 3100 restoration and I'm not sure where the return wiper vacuum hose goes. Wipers are working and I've seen pictures of the hose coming through the firewall near the battery but not sure if it connects or just hangs down for "exhaust". Any advise is welcome.
Tim aka Hiram

Just one hose to the wiper motor, the other tube is just left open under the dash.

wiper hose

thanks, kind of figured it wasn't attached to anything or citical.
Thanks,
Tim aka Hiram