La cornue range hood ventilation requirements: Overview
La cornue range hood ventilation requirements — this page covers the causes, symptoms, safe checks, and repair-cost guidance drawn from La Cornue owner documentation and certified service records.
Range Hood Ventilation Requirements for La Cornue Installations
La Cornue professional-grade ranges and cooktops produce heat output and combustion byproduct volumes significantly higher than typical residential cooking appliances. Adequate ventilation via a properly sized and ducted range hood is not optional — it is a critical safety requirement for any La Cornue installation.
Ventilation Capacity
The range hood must be sized to provide adequate air changes for the total BTU output of the La Cornue appliance installed beneath it. As a general guideline, 100 CFM of hood capacity per 10,000 BTU of total burner output is commonly used, though La Cornue’s installation specifications for each model should take precedence. For a 90cm La Cornue range with a combined burner output of 60,000 BTU/hr, a minimum hood capacity of 600 CFM (before duct pressure derating) is recommended. Higher outputs require proportionally greater hood capacity.
Duct Requirements
All La Cornue installations should use externally ducted, not recirculating, range hoods. Duct runs should be as short and direct as possible, using smooth-wall rigid stainless steel or galvanized duct rather than flexible duct. Each 90-degree elbow reduces effective CFM — factor duct losses into hood selection. Duct diameter must match the hood outlet size and must not be reduced along the run. The exterior duct termination must have a backdraft damper and a vermin-resistant screen. Ductwork must be installed per IMC Section 505 and applicable local mechanical codes.