NFPA aisle math

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

• Aisle accessway requirements NFPA 12.2.5.5.1=12.2.5.5.9 and 13.2.5.5.1-13.2.5.5.8

Condition	Minimum spacing	Increase spacing	Maximum spacing	Maximum row length
Aisles or doors at both ends of rows	12 in seat/back	0.3 in per seat over 14	22 inches	100 seats
Aisle or door at only one end of row	12 in seat/back	.6 in per seat over 7	n.a.	30 feet

Sample problem 1

Aisle access way width problem

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

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 aisle	Seating arrangement	Minimum width
Stepped	Both sides	48 in (new) 42 in (existing)
Stepped	One side	36 in
Level or ramped	Both side One side	42 in 36 in
All	Aisle split by handrail	23(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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