12" X 12" Universal Aluminum Access Panel Door For Wall / Ceiling Application (Push-Lock) With Solid Frame - [Outer Dimensions: 13" Width X 13" Height] RV Mobile Home Tamper-Proof Design – Provides robust Ducting Components RG2016 FBA-HP Applications The C box

Tamper-Proof Design – Provides robust protection to prevent unauthorized access and ensure consistent thermostat settings

Actual Filter Size – 25 3/4"w x 33 3/4" x 1"

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actual front end outer dimensions are approximately 21" width X 21" height

+ Product Details Size – 28"w X 36"h is the size for the duct opening measurement only

12" X 12" Universal Aluminum Access Panel Door For Wall Ceiling Application (Push Lock) With Solid Frame [Outer Dimensions: 13" Width X 13" Height] RV Mobile Home Tamper Proof Design – Provides robust Ducting Components RG2016 FBA HP Applications The C box Tamper Proof Design – Provides robust protection to prevent unauthorized access and ensure consistent thermostat settings Actual Filter Size – 25 3 4"w x 33 3 4" x 1"