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Airflow Instruments IAQ50 - Page 17

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Using
CO?:
%OA=
(Cr-Cs)
/
(Cr-Co)
x
100%
where
%
OA
=
Percentage
of
outside
C
R
=
Concentration
C0
2
of
Cs
=
Concentration
C0
2
of
supply
air
Co
=
Concentration
C0
2
of
outside
air
Using
Temperature:
%
OA=
(Tr-T
s
)
/
(Tr-To)
x
100%
where
%
OA
=
Percentage
of
outside
Tr
=
Temperature
of
return
Ts
=
Temperature
of
supply
To
=
Temperature
of
outside

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