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Calcimator

Cable Tray Firestop Calculator

Calculate intumescent pillow count, wrap strips, and sealant for cable tray penetration firestopping.

Inputs

%

Results

Intumescent pillows

10

Opening area (sq ft)1
Wrap strips needed6
Edge sealant (fl oz)36
Exceeds 40% fill (0/1)0
Total installed cost ($)$368.00
How to Use This Calculator
  1. Enter Tray width (in), Tray height (in), and Cable fill (%).
  2. Set Wall thickness (in) and Fire rating (hrs).
  3. Review the Intumescent pillows result.
  4. Use Opening area (sq ft) and Wrap strips needed to inform your decision.

How the result changes with Tray width (in)

Tray width (in)Intumescent pillows
8.44
198
3314
4418

What each input means

Tray width (in)
Cable tray width.
Tray height (in)
Cable tray depth/height.
Cable fill (%)
Percentage of tray cross-section filled with cables.
Wall thickness (in)
Thickness of the fire-rated wall or floor.
Fire rating (hrs)
Required hourly fire resistance rating.

What each result means

Opening area (sq ft)
Total opening cross-sectional area.
Intumescent pillows
Total pillows needed (both sides of wall).
Wrap strips needed
Intumescent cable wrap strips.
Edge sealant (fl oz)
Sealant for perimeter edges.
Exceeds 40% fill (0/1)
1 = cable fill exceeds typical NFPA max.
Total installed cost ($)
Materials plus labor estimate.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Tray width (in) = 24, Tray height (in) = 6, Cable fill (%) = 40, Wall thickness (in) = 8 = 5 input(s) provided
  2. Calculate Intumescent pillows
    Intumescent pillows
    10 = 10
  3. Calculate Opening area
    Opening area = openingAreaSqIn / 144
    1 = 1
  4. Calculate Wrap strips needed
    Wrap strips needed
    6 = 6

Engine last updated .

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