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Committee Log In
Interpretation #4467
Original Request
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Date:
May 06, 2025
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Requested By:
Ernie MacFerran, PE
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Requester E-Mail:
Ernie.MacFerran@SDHC.K12.FL.US
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Code Version:
2001
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Code:
MECHANIC
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Code Description:
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Chapter:
4
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Section:
403
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Topic:
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Question:
Is it the intent of, the ?exception? in
paragraph 403.3, to submit the type of
comprehensive, support documentation as follows,
to validate intermittent occupancy?
Engineering Calculation and School District
Policy Sheets:
1. School District Education Specification,
outlining the intended student and staff daily
occupancy and normal student scheduling.
2. Graphic calculations illustrating daily
classroom occupancies and occupied periods that
are less than 3 hour duration, compared to the
duration of the a/c system?s operation.
3 Numerical calculations of the
classroom?s daily, ?Adjusted Occupancy Factor?.
Testing and Statistical Data Sheets:
1. Empirical test data of classroom CO2
levels from existing schools, designed and
operating with reduced ventilation rates based
on the ?Adjusted Occupancy Factor?. All tests
are within safe limits; ??.indoor CO2
concentrations less than 700 ppm above outdoor
air concentrations.?
2. A seven year experiment/ test in
approximately 40 schools, with 100% success,
using the adjusted ventilation rates calculated
with the ?Adjusted Occupancy Factor?. No IAQ
problems in any of these schools built (since
1999), and occupied.
References and Collaborating Information Sheets:
1. Letter from FDOE dated April 3, 2003
writes, ?The office, with the Building Code
Official?s concurrence, accepts occupancy
densities, including those based on intermittent
and variable procedure, which deviate from the
prescribed occupant densities in Table 403.3
provided realistic documentation is provided.?
2. BOAF #3996?s Commentary
writes, ?Sufficient documentation must be
submitted to the code official to justify any
deviation from the prescribed occupant
densities. The exception may allow the code
official to accept the occupancy load based on
application of the 3-hour-duration peak
occupancy provision of ASHRAE 62.?
3. BOAF #4346?s Commentary writes, ?The
exception to M403.3 allows design occupancy
density to be reduced with sufficient
documentation.?
4. A list of School Districts (with names
and phone numbers) that use paragraph?s
403.3 ?exception? to institute their
intermittent occupancy calculations.
5. A list of School Districts (with names
and phone numbers) that say they intend to soon
implement paragraph?s 403.3 ?exception? and
calculate their intermittent occupancy.
end.
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