Air vents help control and direct interior your HVAC ducts into the rooms of your home. Most homes have rectangular register vents with louvered grilles. Some homes, however, as well as some offices and spaces that use primarily air conditioning, use circular ceiling venting. Circular vents are known as diffusers because they expel air in a 360-degree pattern, generating better circulation throughout a room and reducing drafts. Some diffusers have dampers that allow the user to control airflow from the duct. Without an adjustable damper, you won't be able to close off the vents without improvising a makeshift solution or retrofitting damped units.
Instructions
1. Set a step stool under the circular vent. Look for either a dial or a small hex hole in the center of the circular vent. If your circular vent does not have a dial or a hex hole, it does not have dampers to close the vent.
2. Rotate the dial clockwise with your fingers if your vent uses a dial. The damper on this type of vent only closes or opens; it does not allow partial opening.
3. Insert a hex key into the hex hole, if your circular vent has the hex hole. Rotate the hex key clockwise to close the butterfly damper. This type of damper does allow for partial closing.
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