System multiplier

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I'm modeling a building with multiple zones per floor. Each floor is
supplied by two identical air handlers supplying 26,000 cfm each. I
would like to model it as a single system. Should I:

1. Model a single AHU with 26,000 cfm and assign it a multiplier
of 2 (system sizing ratio)

2. Model a single AHU with 52,000 cfm without the sizing ratio
(sizing ratio 1).

3. Model both air handlers (would prefer not to).

Vikram Sami, LEED AP

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