Short explanatory segment advising homeowners not to close dampers or block vents. The speaker explains that residential HVAC systems and duct runs are sized to deliver required CFM, describes typical vent placement (angled toward outside walls), and notes exceptions in older or mobile homes.
But regardless, I would not close the dampers, because that's not what your system is made for. Your system is made to heat and cool the home. You have enough runs of ductwork to get the CFM out that the system produces to keep your home comfortable. Same way you should never block a vent. So if you were example, if you were to do a smoke test, say it was in the floor, and you're doing tests on a wall, first of all, most vents you see are angled towards the outside wall because it's trying to handle the spot of the home where the heat or the cool air comes in, infiltrates. And that's the outside walls. Very few times will you see them on the inside wall unless it's a older home or even or a mobile home. And those folks usually aren't comfortable because it's not attacking the outside wall.
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