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City Tech OpenLab > Event Safety > NFPA aisle math

NFPA aisle math

Table of Contents

  • Assignment
  • Example ground plan
  • Aisle spacing table
  • Sample problem 1
  • Sample problem 2
  • Clear width of aisles
  • EXCEPTIONS

Assignment

For this assignment using the tables below update your venue seating ground plan to include your aisle widths and accessway aisles width. They should be labeled on your drawing. Be prepared to explain your decisions at our next class meeting.

  1. Update your ground plan include dimensions of yours seats, aisles and aisle accessways.
  2. Label your fire exits
  3. Include a title block add a scale if you used a scale.
  4. Create a video or power point to present your drawing and aisle math outcomes at our next class session.
  5. Turn in the updated drawing to the assignments tab, NFPA file. Updated seating ground plan.
  6. Post your ppt to the discussion board in your NFPA thread.

Example ground plan

Basketball court seating plan.

Aisle spacing table

ConditionMinimum spacingIncrease spacingMaximum spacingMaximum row length
Aisles or doors at both ends of rows12 in seat/back0.3 in per seat over 1422 inches100 seats
Aisle or door at only one end of row12 in seat/back.6 in per seat over 7n.a.30 feet

Sample problem 1

Aisle access way width problem

Using the table above determine what you believe the proper width should be.

An aisle access way has aisles at both ends. We want to learn what the correct spacing of the distance between the rows of seats should be.

50 seats per aisle 50-14= 36 seats more than 14

36 x 0.3 in per seat ==10.8 in

12in +10.8in= 22.8 in because the maximum requirement is 22”

The answer is 22 inches because 22 inches is the required width for the aisle with aisles at both ends

Sample problem 2

Aisle access way width problem

Using the table above determine what you believe the proper width should be.

An aisle access way has a wall in one direction and an aisle on the other. We want to learn what the correct spacing of the distance between the rows of seats should be.

12 seats per aisle 12-7= 5 seats more than 7

35 x 0.6 in per seat == 3 in

12in +3in= 15 in is the width required for the accessway

Clear width of aisles

Type of aisleSeating arrangementMinimum width
SteppedBoth sides48 in (new) 42 in (existing)
SteppedOne side36 in
Level or rampedBoth side One side42 in 36 in
AllAisle split by handrail23(new) 20 in (Existing)

EXCEPTIONS

  1. All aisle minimum 12” except aisles less than 6’-0” long with no more than four patrons using the aisle.
  2. Unfixed seats: when providing nonfixed seats: If a nonfixed seat is located at table on an aisle accessway the clear width of the accessway should be 19 in or 38in if two chairs are back-to-back.
  • Platforms and stages
    • Platform: is defined as a raised area used for presentations,
    • Regular stage: a stage with a height of 50’-0” or less measured from the lowest point of the stage floor to the highest point of the roof or floor deck above.
    • Legitimate stage- has a height of greater that 50-’0” measured from the lowest point of the stage floor to the highest point of the roof or floor deck above.
  • Special amusement building
    • Children’s play structure in a restaurant

Go back the assignments area and do your weekly quiz and or assignment.

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License

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The OpenLab at City Tech:A place to learn, work, and share

The OpenLab is an open-source, digital platform designed to support teaching and learning at City Tech (New York City College of Technology), and to promote student and faculty engagement in the intellectual and social life of the college community.

New York City College of Technology City University of New York

New York City College of Technology | City University of New York

Support

Help | Contact Us | Privacy Policy | Terms of Use | Credits

Accessibility

Our goal is to make the OpenLab accessible for all users.

Learn more about accessibility on the OpenLab

Copyright

Creative Commons

  • - Attribution
  • - NonCommercial
  • - ShareAlike
Creative Commons

© New York City College of Technology | City University of New York

Event Safety
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