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C:\Windows\Temp\Rar$DI00.000\Fire smoke and grease statement v2_11.doc
October 18, 2004
Mr. Mike Denny
Building Services,
224 West Knight St.
City of Sioux Falls,
South Dakota, 57102
Ph: 605-367-8252
Re: Fire and smoke containment
Dear Mr. Denny:
The TurboChef ovens have been extensively tested and conform to UL 923 and UL KNLZ
standards. The UL 923 standard is the electrical/product safety standard and the KNLZ is the low particulate matter
emissions standard to which we conform. While both standards address difference aspects of the oven, they both
have inherent overlap as it relates to grease/smoke/fire handling.
As it relates specifically to fire safety, UL 923 specifies:
Section 57 Cavity Fire Containment Test:
The performance of an appliance subjected to this test shall be considered
acceptable if all of the following conditions are met:
a) There is no emission of fire, flame, or molten metal outside the appliance nor glowing or ignition
of the cheesecloth, tissue paper, or wood surface;
b) The fuse rated 3 A does not open;
c) Following the test, the appliance complies with the requirements of Leakage Current, Section 33,
and Dielectric Voltage-Withstand Test, Section 39, as applicable to primary circuits; and
d) Following the test and following 10 c of operation (opening and closing the door), the
appliance complies with the requirements in 57.12. The radiation emission shall not xceed
5mW/cm2.
Test Method:
Section 57.2 requires that 4 potatoes each weighing between 150g and 200g be placed inside the
oven under test and cooked using full microwave power and hot air (if applicable) until the potatoes
catch fire. Note: The test must be repeated until it catches fire. During this test, pieces of tissue
paper and cheesecloth are placed above, below and around the product to ensure that the fire
and/or excessive heat generated is safely contained within the confines of the appliance.
As it relates to grease handling, UL KNLZ specifies:
UL KNLZ Guide Information Excerpt:
“These appliances have been evaluated for the limit of 5 mg/m
3
for the emission of grease-laden
air to the room ambient in accordance with the recommendations of the National Fire Protection
Association Standard for Ventilation Control and Fire Protection of Commercial Cooking
Operations, NFPA 96, using the EPA-202 test method prescribed for cooking appliances provided
with integral recirculating air systems.”
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