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Hi there: Nice vectorisation work! You might like this article on the topic. One ting I noticed is that you drew the sleeve on both sides of the hole. You probably thought that having it only on one side of the hole was a mistake because a sleeve goes all the way around. The reason the original drawing only has that on one side is because this is a way in firestop system drawings to indicate that the firestop will work here regardless of whether the hole was formed by a permanent steel sleeve or of the hole was formed by a knock-out plastic or sheet metal sleeves that was removed when the concrete forms were stripped. Best regards, --Achim Hering (talk) 03:05, 20 June 2011 (UTC)