16" X 16" Steel Access Panel Removable Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 18" Width X 18" Height] Sheet Metal /* more readable bullets */

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actual front end outer dimensions are approximately 36 5/8" width X 28 5/8" height

Actual Filter Size – 29 3/4"w x 35 3/4" x 1"

+ Product Details Size – 12" X 4" is the size for the duct opening (floor/vent hole) measurement only

16" X 16" Steel Access Panel Removable Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 18" Width X 18" Height] Sheet Metal /* more readable bullets */+ Product Details 16"w X 16"h is the size for the drywall opening measurement only, actual front end outer dimensions are approximately 2" wider. Most common access door Plastic Frame Easy Installation Just apply caulking or glue to the back of the frame Put in frame and lock the door into place Includes slots for a screwdriver or other prying devices Hinges on the top and bottom The door can be easily removed with a slight squeeze Installation