Chimney extension piece - has ventilation ring through which chimney pipe passes between latter and tubular extension component

摘要

The chimney extension (2) has a tubular portion with top supporting edge and a bottom flange (3) for fixing to the chimney axial ribs (7) on the outside form wind guides, directing it upwards. The section is enclosed by a tubular ring (10) of larger dia. and extending above it. The chimney has a ventilation gap (19) between the pipe (21) and the outer wall (18). A ventilation ring (22) is secured to the top edge of the tubular portion and the pipe protrudes through it, the ventilation gap extending upwards between pipe and tubular portion. The ring external dia. corresponds to that of the latter, and it is held coaxial to the pipe by distance-pieces at the top of the tubular portion, leaving slots for the radial discharge of ventilation air. ADVANTAGE - Improved connection of chimney interior to extension at ventilation gap.