não há muitas diretrizes específicas. tudo o que existe no obc é este:
9.10.22. Fire Protection for Gas, Propane and Electric Cooktops
9.10.22.1. Installation of Ranges
(1) Reserved
(2) Clearances for and protection around gas, propane and electric ranges shall be not less than those provided in Articles 9.10.22.2. and 9.10.22.3.
9.10.22.2. Vertical Clearances above Cooktops
(1) Except as provided in Sentence (2), framing, finishes and cabinetry installed directly above the location of the cooktop shall be not less than 750 mm above the level of cooktop burners or elements.
(2) The vertical clearance described in Sentence (1) for framing, finishes and cabinets located directly above the location of the cooktop is permitted to be reduced to 600 mm above the level of the elements or burners provided the framing, finishes and cabinets,
(a) are noncombustible, or
(b) are protected by,
(i) asbestos millboard not less than 6 mm thick, covered with sheet metal not less than 0.33 mm thick, or
(ii) a metal hood with a 125 mm projection beyond the framing, finishes and cabinets.
9.10.22.3. Protection Around Cooktops
(1) Except as provided in Sentences (2) and (3), combustible wall framing, finishes or cabinets within 450 mm of the area where the cooktop is to be located shall be protected above the level of the heating elements or burners by material providing fire resistance not less than that of a 9.5 mm thickness of gypsum board.
(2) Countertop splash boards or back plates that extend above the level of the heating elements or burners need not be protected as described in Sentence (1).
(3) Except for cabinetry described in Article 9.10.22.2., cabinetry located not less than 450 mm above the level of the heating elements or burners need not be protected as described in Sentence (1).
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9.32.3.12. Outdoor Intake and Exhaust Openings
(1) Separate air intake and exhaust outlet openings, when located on the same wall or roof, shall be installed so as to avoid contamination of the ventilation air by the exhaust air.
(2) Intake openings shall be located so as to avoid contamination of the ventilation air from other local sources such as automobile exhausts and exhaust from adjacent buildings.
(3) The distance from the bottom of an air intake opening to finished ground level or to any nearer and lower permanent horizontal surface shall be not less than 450 mm or the depth of expected snow accumulation, whichever is greater.
(4) The distance separating air intakes from building envelope penetrations that are potential sources of contaminants, such as gas vents or oil fill pipes, shall be not less than 900 mm.
(5) Air intakes shall be clearly labelled as such for identification from locations outside the dwelling unit.
(6) The distance from the bottom of an exhaust outlet to finished ground level or to any nearer and lower permanent horizontal surface shall be not less than 100 mm.
(7) Where air intake and exhaust openings are in exposed locations, provision shall be made to protect them from the entry of precipitation by the use of louvres, weather cowls or other suitable protection.
(8) Air intake openings shall incorporate screens or grilles to protect against the entry of animals and insects.
(9) Except for exhaust outlets serving heat recovery ventilators, exhaust outlets shall incorporate backdraft dampers.
(10) Except for clothes dryers, exhaust outlets shall be fitted with screens of mesh not larger than 15 mm, except where climatic conditions may require larger openings.
(11) Where a screen or grille required by Sentences (8) and (10) has a screen mesh less than 6 mm, the screen or grille shall be removable for cleaning.
(12) The gross area of the screens or grilles installed in intake and exhaust openings shall be three times that of the duct served.
(13) Screens and grilles shall be of corrosion-resistant material.
(14) The net free area of an air intake or exhaust outlet shall be equal to or greater than the cross-sectional area of the duct served.
9.32.3.13. Installation
(1) Installation of fans and heat recovery ventilators shall be in accordance with manufacturer’s instructions for minimizing noise and vibration transmission and achieving the required sound rating.
(2) Where flow-regulating dampers are required, they shall be adjustable and accessible without requiring the removal of fans, motors, or insulating materials and without the need for specialized tools.
(3) Ventilation equipment shall be accessible for inspection, maintenance, repair and cleaning.
(4) Ventilation equipment installed in unheated spaces shall be installed so as to avoid condensation of moisture on fans and motors in accordance with the manufacturer’s instructions.
no entanto, se você está procurando conselhos:
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numa parede de alvenaria sólida, uma penetração através da parede para uma pilha ou descarga de ventilação não deve estar a 300 mm de uma janela ou lintel da porta (desta forma evita-se o colapso do furo de uma carga suspensa transferida .
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Se você tiver lintel de alvenaria (tipo de arco caternário), eu ficaria muito cauteloso em fazer uma penetração em qualquer lugar perto do pé do arco sem um engenheiro olhando para ele. lintéis de alvenaria podem exibir enormes forças compressivas horizontais em uma parede sólida, um longo caminho horizontalmente a partir do pé. você geralmente tem que cobrir o interior do orifício de penetração com uma seção espessa de tubo de aço para suportar a carga.
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se você não puder atravessar a parede por qualquer razão, apenas suba. você pode desabafar
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a) diretamente para cima através do espaço do sótão, em seguida, através do telhado (lembre-se de usar tubo isolado e uma pilha de tetos adequada, tampa e bota impermeável
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b) no espaço do sótão e sair pelo beiral com uma porta de respiro de queda de intradorso (apenas certifique-se de usar tubo isolado e uma abertura de ventilação com uma válvula deflectora).
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não use, sob nenhuma circunstância, duto de metal flexível . não é legal e faz para um enorme pesadelo de limpeza ao longo do tempo com um escape de cozinha. use apenas tubo de duto de aço galvanizado rígido
espero que ajude