1.   The vent was covered with a grille.

2.   Cover the vents of your room air conditioner with cheesecloth to trap pollen.

3.   It is also a relatively easy matter to cut a filler piece or plug to cover the vent in the winter.

4.   The only reason to close or cover the vents is to prevent water vapor condensing into water in the duct and dripping out of the vents.

5.   Then, the handyman bought two wonderful cast iron grilles, made by the Reggio Register Co. of Ayer, Mass., to cover the vents.

6.   To stop this, either cover the vents themselves with plastic, and tape the plastic tightly to the ceiling.

7.   Television shots and commentary by television announcers indicated the vents were covered by Super Bowl decoration.