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What is the net frame size of the block unit? The net frame size is 1/2" smaller than the rough opening. For example if the rough opening is 40 3/4" x 40 3/4" then the net frame size would be 40 1/4" x 40 1/4".    User Comments What is the net frame size of the block unit?   No User Comments Found	Additional Info    Article # 21  Posted on 13 May, 2008  Viewed 702 times      Attachments        Did this help you? Yes  No       Related Articles