Running furnace with slideouts in.

PackerBacker wrote:

Dog Trainer wrote:
If you have uncovered vents the air that is blocked will not cause any pressure back up in your furnace. The air will simply be re directed to the open vents. When I tow in the cold days I will stop a couple of hours before we set up for the night and fire up the furnace I have never had a problem with our trailer and have done this many times.

Exactly. When winter camping I've purposely blocked off vents in the bedroom to get more heat flow in the living room to get the temperature up quickly there.

When we had our Class A we often ran the furnace while traveling with a vent blocked.