Firewall Bulkhead Fitting

[John McIntire]

Was wondering the need for a bulkhead fitting to route the heating and AC lines.

I was thinking of just running the lines through the fresh air vent out through the original blower motor hole and over the inner fender.

What's your thoughts on this? What have you guys done? I'm thinking it'll be a few less fittings and parts and less chance of leaks if I just run my lines from A to B.

Thanks!