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1346.0507 SECTION 507 COMMERCIAL KITCHEN HOODS.

Subpart 1.

Section 507.1.

IMC Section 507.1 is amended by adding subsection 507.1.1 after the exceptions to read as follows:

507.1.1 Factory built systems with exhaust or recovery. Where factory built commercial cooking recirculating systems or dishwashers and potwashers equipped with heat and vapor exhaust or recovery systems are installed, the sensible and latent heat from the systems shall be included in the HVAC design calculations of the kitchen. A mechanical HVAC system shall be provided to maintain maximum relative humidity of 65 percent in the space.

Subp. 2.

Section 507.2.

IMC section 507.2 is amended to read as follows:

507.2 Where required. A Type I or Type II hood shall be installed at or above all commercial cooking appliances in accordance with ASHRAE standard 154. Where any cooking appliance under a single hood requires a Type I hood, a Type I hood shall be installed. Where a Type II hood is required, a Type I or Type II hood shall be installed.

507.2.1 Type I hoods. Type I hoods shall be installed where cooking appliances produce grease or smoke as a result of the cooking process. Type I hoods shall be installed over medium-duty, heavy-duty, and extra-heavy-duty cooking appliances. Type I hoods shall be installed over light-duty cooking appliances that produce grease or smoke. The duty classifications of cooking appliances served by Type I hoods shall be in accordance with Table 507.2.1.

Exception: A Type I hood shall not be required for an electric cooking appliance where an approved testing agency provides documentation that the appliance effluent contains 5 mg/m3 or less of grease when tested at an exhaust flow rate of 500 cfm (0.236 m3/s) in accordance with Section 17 of UL 710B.

Table 507.2.1

Appliance Duty Classifications by Appliance Type

Appliance Description Size Type I Hoods
Light Duty Medium Duty Heavy Duty Extra-Heavy Duty
Braising pan/tilting skillet, electric All
Oven, rotisserie, electric and gas All
Oven, combi, electric and gas All
Oven, convection, full-size, electric and gas All
Oven, convection, half-size, electric and gas (protein cooking) All
Oven, deck, electric and gas All
Oven, mini-revolving rack, electric and gas All
Oven, rapid cook, electric All
Oven, rotisserie, electric and gas All
Range, discrete element, electric (with or without oven) All
Salamander, electric and gas All
Braising pan/tilting skillet, gas All
Broiler, chain conveyor, electric All
Broiler, electric, under-fired All
Conveyor oven, electric 6 kW or larger
Conveyor oven, gas All
Fryer, doughnut, electric and gas All
Fryer, kettle, electric and gas All
Fryer, open deep-fat, electric and gas All
Fryer, pressure, electric and gas All
Griddle, double-sided, electric and gas All
Griddle, flat, electric and gas All
Range, cook-top, induction All
Range, open-burner, gas (with or without oven) All
Range, hot top, electric and gas All
Broiler, chain conveyor, gas All
Broiler, electric and gas, over-fired (upright) All
Broiler, gas, under-fired All
Range, wok, gas and electric All
Appliances using solid fuel (wood, charcoal, briquettes, and mesquite) to provide all or part of the heat source for cooking
Exception: Appliances complying with Section 14.3.4 of NFPA Standard 96 All

507.2.1.1 Operation. Type I hood systems shall be designed and installed to automatically activate the exhaust fan whenever cooking operations occur. The activation of the exhaust fan shall occur through an interlock with the cooking appliances, by means of heat sensors or by means of other approved methods. A method of interlock between an exhaust hood system and appliances equipped with standing pilot burners shall not cause the pilot burners to be extinguished. A method of interlock between an exhaust hood system and cooking appliances shall not involve or depend upon any component of a fire extinguishing system.

507.2.2 Type II hoods. Type II hoods shall be installed above dishwashers and appliances as required by Table 507.2.2. The duty classifications of cooking appliances served by Type II hoods shall be in accordance with Table 507.2.2. Type II hoods shall be installed above all appliances that produce products of combustion and do not produce grease or smoke as a result of the cooking process. Where hoods are not required, the additional heat and moisture loads generated by such appliances shall be accounted for in the sensible and latent loads for the HVAC system.

Table 507.2.2

Type II Hood Requirements by Appliance Description

Appliance Description Size Hood Not Requireda,b Type II Hoodsa
Light Duty Medium Duty
Cabinet, holding, electric All
Cabinet, proofing, electric All
Cheese-melter, electric All
Coffee maker, electric All
Cooktop, induction, electric All
Dishwasher, under-counter, electric All
Dishwasher, powered sink, electric All
Drawer warmer, 2 drawer, electric All
Egg cooker, electric All
Espresso machine, electric All
Grill, panini, electric All
Hot dog cooker, electric All
Hot plate, countertop, electric All
Ovens, conveyor, electric < 6 kW
Ovens, microwave, electric All
Ovens, warming, electric All
Popcorn machine, electric All
Rethermalizer, electric All
Rice cooker, electric All
Steam table, electric All
Steamers, bun, electric All
Steamer, compartment atmospheric, countertop, electric All
Steamer, compartment pressurized, countertop, electric All
Table, hot food, electric All
Toaster, electric All
Waffle iron, electric All
Cheese-melter, gas All
Dishwasher, conveyor rack, chemical sanitizing All
Dishwasher, conveyor rack, hot water sanitizing All
Dishwasher, door-type rack, chemical sanitizing All
Dishwasher, door-type rack, hot water sanitizing All
Kettle, steam jacketed, tabletop, electric, gas and direct steam < 20 gallons
Oven, convection, half-size, electric and gas (nonprotein cooking) All
Pasta cooker, electric All
Rethermalizer, gas All
Rice cooker, gas All
Steamer, atmospheric, gas All
Steamer, pressurized, gas All
Steamer, atmospheric, floor-mounted, electric All
Steamer, pressurized, floor-mounted, electric All
Kettle, steam-jacketed floor-mounted, electric, gas and direct steam < 20 gallons
Pasta cooker, gas All
Smoker, electric and gas, pressurized All
Steam-jacketed kettle, floor-mounted, electric and gas 20 gallons or larger

a A hood shall be provided for an electric appliance if it produces 3.1 x 10-7 lb/ft3 (5 mg/m3) of grease or more when measured at 500 cfm (236 L/s).

b Where hoods are not required, the additional heat and moisture loads generated by such appliances shall be accounted for in the sensible and latent loads for the HVAC system.

507.2.2.1. Type II hood exhaust flow rates. The net exhaust flow rate for Type II hoods shall comply with Table 507.2.2.1. The duty level for the hood shall be the duty level of the appliance that has the highest (heaviest) duty level of all of the appliances that are installed underneath the hood according to Table 507.2.2.

Table 507.2.2.1

Type II Hood Minimum Net Exhaust Airflow Rates

Type of Hood Minimum Net Exhaust Flow Rate per Linear Hood Length in cfm/ft (L/s/m)
Light-Duty Equipment Medium-Duty Equipment
Wall-mounted canopy 200 (310) 300 (465)
Single island 400 (620) 500 (775)
Double island (per side) 250 (388) 300 (465)
Eyebrow 250 (388) 250 (388)
Backshelf/Pass-over 200 (310) 300 (465)

507.2.2.2 Type II hood overhang. Type II hoods shall overhang the appliances and equipment served in accordance with Table 507.2.2.2.

Table 507.2.2.2

Minimum Overhang Requirements for Type II Hoods

Type of Hood End Overhang Front Overhang Rear Overhang
Wall-mounted canopy 6 in. (154 mm) 12 in. (154 mm) N/A
Single-island canopy 12 in. (154 mm) 12 in. (154 mm) 12 in. (154 mm)
Double-island canopy 12 in. (154 mm) 12 in. (154 mm) N/A
Eyebrow N/A 12 in. (154 mm) N/A
Backshelf/Proximity/
Pass-over
6 in. (154 mm) 10 in. (254 mm) (setback) N/A

N/A = not applicable

Subp. 3.

[Repealed, 34 SR 537]

Subp. 4.

[Repealed, 39 SR 690]

Subp. 5.

[Repealed, 34 SR 537]

Subp. 6.

Section 507.4.

IMC section 507.4 is deleted.

Subp. 7.

Section 507.5.

IMC section 507.5 is amended to read as follows:

507.5 Type II hood materials. Type II hood materials shall be constructed of stainless steel not less than 0.024 inch (0.61 mm) (No. 24 Gage) in thickness, copper sheets weighing not less than 24 ounces per square foot (7.3 kg/m2), or of other approved material and gage.

Subp. 8.

Section 507.7.

IMC section 507.7 is amended to read as follows:

507.7 Hood joints, seams, and penetrations. Hood joints, seams, and penetrations shall comply with amended IMC sections 507.7.1 and 507.7.2.

Subp. 9.

Section 507.7.1.

IMC section 507.7.1 is amended to read as follows:

507.7.1 Type I hoods. Type I hoods shall be designed, constructed, and installed in accordance with Chapter 5 of NFPA 96.

Subp. 10.

Sections 507.8 to 507.11.2.

IMC sections 507.8 to 507.11.2 are deleted.

Subp. 11.

[Repealed, 34 SR 537]

Subp. 12.

Section 507.14.

IMC section 507.14 is deleted.

Subp. 13.

[Repealed, 34 SR 537]

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.02; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537; 39 SR 690

Published Electronically:

January 28, 2015

700 State Office Building, 100 Rev. Dr. Martin Luther King Jr. Blvd., St. Paul, MN 55155 ♦ Phone: (651) 296-2868 ♦ TTY: 1-800-627-3529 ♦ Fax: (651) 296-0569