I would like to be able to use the vents in my house in a way that targets specific rooms/areas more than others. Sometimes I want to completely close off a room from being temperature-regulated by the furnace or air conditioning.
It seems like most of my vents still let a significant amount of air through when I close them (I would estimate that closing the vent still lets through 20-40% of the air).
Is this intended? Would it be harmful to the furnace blower if I got vents that would seal completely and if I were to close 30-40% of the vents throughout my house in order to target the air in specific rooms?