Use and Care Manual
Page 8
... ventilation. DO NOT obstruct or block the Flammable Vapor Sensor. Buildings of unusually tight construction shall have the combustion and ventilation air supplied from A/C and refrigeration equipment are highly corrosive after passing through two permanent openings of rectangular air ducts shall not be smaller than 50 cubic feet per 2000 Btuh...
... ventilation. DO NOT obstruct or block the Flammable Vapor Sensor. Buildings of unusually tight construction shall have the combustion and ventilation air supplied from A/C and refrigeration equipment are highly corrosive after passing through two permanent openings of rectangular air ducts shall not be smaller than 50 cubic feet per 2000 Btuh...