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When a vent is less than 10 feet high, the vent should be at least as large as the flue collar outlet.b) Vents for draft hoods or flue collars 12 inches in diameter or less should NOT be reduced more than one pipe size.
Cut a length of 1 1/2-inch pipe that reaches from the elbow to the point where the vent rises. Insert it through the holes and glue it to the elbow. Glue a second elbow to the other side of the pipe with its outlet facing upward. Drill a 1 5/8-inch hole into the top plate of the wall and extend the vent into the attic. Route it horizontally to the main vent stack. Tie it in with a reducing sanitary tee that fits the stack and the new vent. PVC sanitary tee, 2-inch by 2-inch by 1 1/2-inch.