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The best way to close square ceiling vents is to use an adjustable vent cover. These covers are designed to fit over the opening and can be adjusted to fit tightly, blocking the airflow through the opening. Alternatively, you can also use foam insulation or weatherstripping around the edges of the vRead more
The best way to close square ceiling vents is to use an adjustable vent cover. These covers are designed to fit over the opening and can be adjusted to fit tightly, blocking the airflow through the opening.
Alternatively, you can also use foam insulation or weatherstripping around the edges of the vents to seal them off.
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