VENTILATING SYSTEMS EACH CONSISTING OF A SUPPLY AIR SECTION HAVING A BLOWER, FILTERS AND A SUPPLEMENTARY AIR HEATER, AN EXHAUST AIR SECTION HAVING A BLOWER AND DAMPERS, A HEAT RECOVERY SECTION HAVING FACE AND BYPASS DAMPERS, A RANGE HOOD SECTION HAVING SUPPLY AIR PLENUMS AND DISCHARGE GRILLES, GREASE EXTRACTERS AND WASHERS, AND FIRE DAMPERS AND EXTINGUISHERS, AND DUCTING AND SUPPORTS ASSOCIATED WITH SAID SECTIONS, SAID SYSTEMS BEING PRIMARILY INTENDED FOR INSTITUTIONAL AND COMMERCIAL KITCHENS...