If my house wants another inborn gas vent, should I attain a plumber or hvac soul to install it?

And how much is it likely to cost? And/or how various hours is it likely to clutch them to do it? The type of vent that would be used for a tankless water electric fire, or any appliance with a fan-powered vent.

It's a typical A-frame house. One story, slab foundation, moderately steep roof, unused attic (just insulation and access)
Answers:    Either one should be capable of do the task. If the nat. gas hookup is already contained by place, wherever your wet heater is, the technician will drill through an exterior wall and install the vent within. He should be able to install some sort of allure ring or something on the outside to hide the vent pipe. Be prepared to spend probably more or less $400 for the job, most of which will be for labor. It should one and only take an hour or two to complete the available job.
HVAC guy usually does vents. guess would be one day's work.