NOVELTY - The apparatus (10) has a mount (20) fixably attached to a carbonizing machine (14) at an opening (18) on the carbonizing machine. A duct (28) is fixably attached within the mount, and conducts gas vented from the carbonizing machine. A scraper (24) is movably attached between the mount and the duct and slid between an inner surface of the mount and an outer surface (30) of the duct. The scraper comprises a leading edge (36) to scrape an inner surface (44) of the opening when the scraper is extended.    USE - Vent scraping apparatus for a carbonizing machine used to convert organic waste material i.e. municipal solid waste (MSW), into a useful char product.    ADVANTAGE - The apparatus solves problem of deposited material clogging in a carbonizing machine gas opening. The apparatus effectively removes deposited material for duct work, and is self-cleanable. The apparatus can be easily integrated with a motor or drive system to facilitate performance of automatic and periodic scrapes without human intervention. The apparatus can be activated without interrupting normal operation of the carbonizing machine or release of gas. The apparatus can be used with vertical or horizontal duct work designs. The scraper extends downward through the opening of the carbonizing machine to scrape inner surfaces of the opening to facilitate scraping of an inner surface of a barrel opening such that sidewalls of the scraper are cutaway to conform to profile and to avoid contact with dual screws. The scraper does not interfere with flow of released gas since the scarper is hollow to avoid contact with the dual screws, so that the apparatus can be used to periodically remove deposited material, while the carbonizing machine is in normal operation. The leading edge of the scraper avoids contact with the dual screws when the scraper is fully extended into the opening of the carbonizing machine. The apparatus prevents buildup of deposited material.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a carbonizing apparatus comprising dual screws.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a vent scraping apparatus.    Vent scraping apparatus (10)    Carbonizing machine (14)    Opening of carbonizing machine (18)    Mount (20)    Scraper (24)    Duct (28)    Outer surface of duct (30)    Leading edge of scraper (36)    Inner surface (44)