I think I understand now and yes...you do both when there are numbers in both columns on the table...But the kitchen only has exhaust numbers...
Kitchens (cooking)b — — — 0.7
Consider a barber shop of 1,000
square feet with a zone air distribution effectiveness
(Ez) of one. It will require 500 cfm of exhaust ventilation
and 247.5 cfm of outdoor air. Rather than requiring a
total outdoor air rate of 747.5 cfm to satisfy both ventilation
needs (i.e., 247.5 cfm OA ventilation plus 500
cfm OA as makeup for the exhaust), the code intends
to allow the 247.5 cfm of outdoor air to serve as part of
the makeup air for the exhaust system with the remaining
252.5 cfm of makeup air being from some other
source.
The code intends to make sure that a minimum rate
of outdoor air is supplied to the space for occupant
well-being in the case where the makeup air for the
exhaust system is composed entirely of used ventilation
air transferred in from some other space.
But....W/O the type 2 hood 507.3 gets you the space ventilation Or appliance ventilation...Whichever is worse...Or the commentary is wrong...
If cooking appliances are provided and a Type II
hood is not required, the space where the appliances
are located must be provided with exhaust at a rate of
0.7 cfm/ft2 [0.0036 m3/(s m2)], which is the same rate
as kitchens in Table 403.3.1.1. To apply this rate, each
individual appliance is considered as occupying 100
square feet (9.29 m2). The purpose of this requirement
is to provide a minimal amount of exhaust in the area
where one or more of these appliances are installed. If
cooking appliances are installed in a typical commercial
kitchen where the kitchen ventilation rate is being
applied to the whole space, then the area of the
kitchen would be used to determine the ventilation rate
without adding the additional 100 square feet for each
appliance. Note however, if the kitchen is small and
the number of appliances multiplied by 100 square
feet is greater than the area of the kitchen, the exhaust
rate for the kitchen must be based on the area calculated
in accordance with this section.