501.8 Appliances Not Required to Be Vented
The following appliances shall not be required to be vented.
- Built-in domestic cooking units listed and marked for optional venting.
- Hot plates and laundry stoves.
- Type 1 clothes dryers (Type 1 clothes dryers shall be exhausted in accordance with the requirements of Section 614).
- A single booster-type automatic instantaneous water heater, where designed and used solely for the sanitizing rinse requirements of a dishwashing machine, provided that the heater is installed in a commercial kitchen having a mechanical exhaust system. Where installed in this manner, the draft hood, if required, shall be in place and unaltered and the draft hood outlet shall be not less than 36 inches (914 mm) vertically and 6 inches (152 mm) horizontally from any surface other than the heater.
- Counter appliances.
- Room heaters listed for unvented use.
- Direct-fired makeup air heaters.
- Other appliances listed for unvented use and not provided with flue collars.
- Specialized appliances of limited input such as laboratory burners and gas lights.
Where the appliances listed in Items 5 through 11 above are installed so that the aggregate input rating exceeds 20 British thermal units (Btu) per hour per cubic feet (207 watts per m3) of volume of the room or space in which such appliances are installed, one or more shall be provided with venting systems or otherapproved means for conveying the vent gases to the outdoor atmosphere so that the aggregate input rating of the remaining unvented appliances does not exceed 20 Btu per hour per cubic foot (207 watts per m3). Where the room or space in which the appliance is installed is directly connected to another room or space by a doorway, archway or other opening of comparable size that cannot be closed, the volume of such adjacent room or space shall be permitted to be included in the calculations.