8 DEMETRAEN8.4 HEIGHT-DEPRESSIONThe depression (draught) of a chimney flue depends also on its height. Check the depression with the valuesprovided at FEATURES page 37. Minimum height 4,5 meters.8.5 MAINTENANCE• The chimney flue must be cleaned, since the soot and unburnt oil deposits reduce its section so blocking thedraught. In great quantities they can flare up.• The fumes extraction pipes (fumes conduit + chimney flue + chimney pot) must always be cleaned, scrubbedand checked by an expert stove-repairer, in compliance with current regulations, with the instructions of thestove-manufacturer and the directives of your insurance company.• In case of doubts, please follow the most restrictive regulations.• Have your chimney flue and chimney pot checked and cleaned by an expert chimney sweep at least oncea week. The chimney sweep has to release a written declaration about the security of the system.• Not cleaning compromise safety.8.6 CHIMNEY POTFig. 4 - Anti-wind chimney potsThe chimney pot is important for the correct running of the heating appliance:• We recommend using an anti-wind chimney pot, see Fig. 4 page 8.• The hole width for fumes exhaust must be the double of the chimney flue width and fitted in a way that thefume exhaust is assured also in case of wind.• It should prevent the infiltration of rain, snow and animals.• The outlet height in the atmosphere must be away from the reflux area caused by the roof structure or byobstacles laying nearby (see FEATURES page 37).