Measure the size of the air duct opening.
How to replace exterior bathroom vent cover.
Remove the screws that hold the vent in place.
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Locate the register or grille you are replacing and note if it is for a wall ceiling or floor.
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Without it lint and warm moist air may back up into the home which can cause mold or other damage inside or to the structure of the house.
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Do not measure the old register or vent.
To replace old outdoor vent covers first pull apart the duct at the last joint inside the house.
Pull the vent forward and out of the opening.
If they don t pull apart easily look for small screws holding the sections of pipe together.