Engineering

Compare FSI and SDI against Class A regulatory thresholds

To deterministically validate fire safety compliance for specification approval and authority-of-jurisdiction review.

Engineering Verified

Quick Answer

The compare fsi and sdi against class a regulatory thresholds computes fsi_margin, sdi_margin, compliance_status from the input values you provide.

Calculator

FSI_margin (dimensionless)
—
SDI_margin (dimensionless)
—
compliance_status (boolean)
—

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Result Interpretation

Compare FSI and SDI against Class A regulatory thresholds computes FSI_margin in dimensionless and SDI_margin in dimensionless and compliance_status in boolean using the defined engineering formula and the input values provided. FSI_margin is expressed in dimensionless; SDI_margin is expressed in dimensionless; compliance_status is expressed in boolean. No universal acceptance threshold is defined by this calculator.

Worked Example

compliant_panel

Given:

  • FSI = 20
  • SDI = 400

Expected Result:

  • FSI_margin = 5
  • SDI_margin = 50
  • compliance_status = 1

Engineering Interpretation:

Under the given input conditions, the calculated result is: FSI_margin = 5 dimensionless; SDI_margin = 50 dimensionless; compliance_status = 1 boolean.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.

Formula / Method

fsi_margin = 25 - fsi; sdi_margin = 450 - sdi

FSI_margin; SDI_margin; compliance_status.

Variables

SymbolLabelRoleDescription
FSI FSI INPUT FSI
SDI SDI INPUT SDI
FSI_margin FSI_margin OUTPUT FSI_margin
SDI_margin SDI_margin OUTPUT SDI_margin
compliance_status compliance_status OUTPUT compliance_status
class_a_fsi_limit class_a_fsi_limit CONSTANT class_a_fsi_limit = 25
class_a_sdi_limit class_a_sdi_limit CONSTANT class_a_sdi_limit = 450

Calculation Steps

  1. Enter the fsi in dimensionless.
  2. Enter the sdi in dimensionless.
  3. Step 1: Compute fsi_margin.
  4. Step 2: Compute sdi_margin.
  5. Read the fsi_margin (dimensionless) from the results.
  6. Read the sdi_margin (dimensionless) from the results.
  7. Read the compliance_status (boolean) from the results.

Frequently Asked Questions

What does this calculator calculate?

The Compare FSI and SDI against Class A regulatory thresholds estimates FSI_margin, SDI_margin, compliance_status based on the input parameters you provide

Why is fsi important in this calculation?

fsi is directly proportional to fsi_margin. When you enter fsi in dimensionless, the calculator uses it in the engineering formula to compute the output

How should I interpret the result fsi_margin?

The calculator outputs fsi_margin in dimensionless. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: FSI (dimensionless), SDI (dimensionless). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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