8" X 8" Universal Aluminum Access Panel Door For Wall / Ceiling Application (Push-Lock) With Solid Frame - [Outer Dimensions: 9" Width X 9" Height] with filter The operable dampers

The operable dampers

It comes with two versatile mounting base options—solid and ring—making installation simple and flexible

Measure the size of the air drywall opening

If your hole is 14" wide by 20" tall

Actual Filter Size – 17 3/4"w x 21 3/4" x 1"

8" X 8" Universal Aluminum Access Panel Door For Wall / Ceiling Application (Push-Lock) With Solid Frame - [Outer Dimensions: 9" Width X 9" Height] with filter The operable dampers+ Product Details Size 8" X 8" is the size for the drywall opening measurement only, actual front end outer dimensions are 9" width X 9" height High Quality High grade aluminum solid frame construction. Design Aluminum frame with no welded edges. Fully removable door with a spring loaded hinge. Open close easily with push lock technology, just push open and push close. Easy Access Provides easy access for HVAC, plumbing, electrical, crawlspace etc.