• Welcome to The Building Code Forum

    Your premier resource for building code knowledge.

    This forum remains free to the public thanks to the generous support of our Sawhorse Members and Corporate Sponsors. Their contributions help keep this community thriving and accessible.

    Want enhanced access to expert discussions and exclusive features? Learn more about the benefits here.

    Ready to upgrade? Log in and upgrade now.

When is a 90+% HE furnace no longer 90%?

jar546

jar546

CBO
Joined
Oct 16, 2009
Messages
12,725
Location
Not where I really want to be
When you don't bring combustion air from outside because you are too lazy to run pvc.

I see this all the time and then they are closed in rooms with inadequate net free air.

It is the manufacturer's that will tell you this in the installation instructions.

Anyone else?
 
Don't see it too much here. They have to run the PVC vent so you might as well install the concentric kit and get your fresh air too. Lazy or cheap? Sometimes I wonder.
 
You must log in or register to reply here.
Back
Top