F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
Landscapes
Engineering & Computer Science
(AREA)
Chemical & Material Sciences
(AREA)
Combustion & Propulsion
(AREA)
Mechanical Engineering
(AREA)
General Engineering & Computer Science
(AREA)
Buildings Adapted To Withstand Abnormal External Influences
(AREA)
Structure porteuse en beton arme, procede pour sa realisation ainsi qu'element prefabrique en beton arme, bati de coffrage et procede pour la fabrication d'elements prefabriques en beton arme et elements prefabriques en forme de caissons comportant des plaques jumelees