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2. Determine cubic feet of kitchen area for
initial cubic feet of air movement
recommended
Calculate additional cfm recommended
based on the size and fuel type of cooking
appliance
Design and measure the duct run and
determine your EDL (Equivalent Duct
Length)
Consider air capture of hood based
on design and location of the hood.
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3. Consider additional variables in the
kitchen design
Provide make up air when required
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5. EXAMPLE
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7. GAS COOKING
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8. ELECTRIC / INDUCTION COOKING
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9. Equivalent Duct Length
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10. CALCULATE THE DUCT RUN
REQUIREMENT
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12. LET’S DETERMINE THE CFM
REQUIRED FOR THE FOLLOWING EXAMPLE
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13. CALCULATIONS
180 cfm
640 cfm
1140 cfm
1425 cfm
105 cfm
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15. Location of cooking surface – wall or
island. Consider increasing coverage for
an island hood.
Cooking appliance manufacturer
recommendations for ventilation.
Hood manufactures required distance
from cooking surface.
Ceiling height and mounting options.
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16. Width and depth of cooking surface
Design of hood chosen and depth of
hood sump.
Type of blower –internal, in line or
external remote blower.
Noise level of selected hood on
lowest speed and highest speed.
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17. Hood lighting and “Green Features”
Only use downdraft ventilation when
recommended by the manufacturer.
Only 2 manufacturers of pro style ranges and range tops
approve their own downdraft products for select models.
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19. 2012 IRC CODES REGARDING
MAKE UP AIR
Makeup air requirements associated with vented kitchen range hoods:
(IRC M1503.4, M1501.2, G2447.6)
 Three code provisions can trigger the need for makeup air in this situation. The
bottom line is that makeup air is always required for high-volume hoods (> 400 cfm)
and may be required for lower volume hoods when natural-draft appliances are used.
 M1503.4 requires makeup air for kitchen hoods which exhaust more than 400
cfm. The makeup airflow rate must equal the exhaust flow rate and an intake damper
on the makeup air duct must be interlocked with the control for the fan.
 M1501.2 requires that “ducted exhaust systems” (such as kitchen hoods, bath
fans, clothes dryers) not induce negative pressure in excess of negative 3 Pascal's at the
location of a natural draft combustion appliance. This provision applies regardless of
the rated airflow of the exhaust system.
 G2447.6 reinforces M1501.2, more explicitly for vented kitchen hoods. This
provision is independent of the rated airflow through the hood.
 A pressure test is required to demonstrate that the depressurization level is within
the 3 Pascal limit. If the depressurization limit is exceeded, makeup air is one potential
solution.
 There is no requirement to temper makeup air.
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20. REASONS TO HAVE MAKE UP AIR
• Recommended by hood manufacturer
• HEALTH - Carbon Monoxide, contaminants
• SAFETY - fireplace ambers
• Avoiding negative air pressure
• Local building codes
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21. Verify the
dampers
operate
properly.
Do not
oversize the
exhaust fan
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24. What can increase the noise level of the hood?
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25. BLOWER MOTOR: TYPE
Single phase - Three phase - Linear
LOCATION
FILTER: TYPE
Mesh - Baffle - Channel - Recirculating - Downdraft
DESIGN: HOOD
DUCT
length, turns, interior obstacles
NOISE SUPPRESSION SYSTEMS
In line silencers
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29. Well Matched Hoods
& Cooking Surfaces
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31. Approved Kitchen Ventilation
although not always recommended
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33. Unique Kitchen Ventilation Designs
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