How to Replace Ceiling Air Diffusers

Climb up onto a chair or a ladder so that you can easily access the ceiling air diffuser. For safety purposes, the ladder or chair must be tall enough so that both of your hands can lay flat on the ceiling.

Note the shape of the diffuser and then measure the length and the width using a tape measure. If the diffuser is round, simply measure the diameter, which is the distance from one side to the other through the center. Take the measurements with you to purchase a replacement diffuser at a hardware store.

Look at the center of the diffuser to see if there is a post that hangs down from the center. If so, grasp it with your hand and turn it counterclockwise until it detaches. Then pull it down from the ceiling. If no post exists, skip this step.

Look at the perimeter or center of the diffuser and locate the three to four screws that hold it to the ceiling. Remove each screw by turning them counterclockwise with a screwdriver.

Grasp the diffuser and pull it down from the ceiling gently. Set the old diffuser aside and pick up the replacement diffuser.

Push the top of the new diffuser into the ceiling until it is flush. Insert the new screws into the screw holes to secure it to the ceiling or the upper vent assembly, depending on the model.

Insert the center post, if applicable, by turning it clockwise until it is secure.