Subwoofer to battery cable routing

[elorenzof]

I was wondering, I'd like to run my subwoofer to battery power cable thru the fresh air vent on the passenger side to run it between the inner and outer fender / keep it tucked up so there's less of the power cable to be seen. I have a vintage air ac kit, and it comes with a plate to cover that factory passenger side vent hole as im pulling my factory ac unit and such on the firewall out. would this be doable?