*TB 25- Gymnasium Floor Fires

Question 1

Gymnasium floors are constructed of tongue and groove hardwood, built up off of concrete on cross-laid strips to allow for ventilation under the floor. In essence, the floor is _____, with a metal angle sealing it to the wall.

Answer 1

Free floating

Question 2

Gym floor fires:
Ventilated air passes beneath gymnasium floor plenums and into special heat/pump rooms where ____% of the-air is exhausted and ____% fresh air is drawn in and heated.

Answer 2

20 and 20%

Question 3

During a gym floor fire and with the floor ventilation system left on, ____ % of air will be exhausted (smoke), with ____% being recirculated back into the gymnasium. The fire will be drawn throughout the floor by this forced draft.

Answer 3

• 20%

* 80%

Question 4

Gym floor fires:

If a fire should start in a gym floor the main power to the gymnasium must be ____

Answer 4

Shut off

This will prevent the ventilation system from force feeding the fire

Question 5

Most construction members under a gym floor are spaced ___ inches on center.

Answer 5

18”

Question 6

Gym floor fires:

What size is the metal angle iron used to seal the gym floor to the wall?

Answer 6

3”x3”x1/4”

Question 7

Gym floor fires:

What size is the diagonal sub flooring used in gym floors? This flooring is under the hardwood tongue and groove floor.

Answer 7

1”x6”

Question 8

Gym floor fires:

Air return grills for gym floor ventilation are located approx every ____ ft.

Answer 8

10

Question 9

Gym floor fires:
Air is supplied for the gymnasium floor ventilating system by large fans which draw air into air return grilles located along the walls approximately ___ feet above the floor’s surface

Answer 9

2 ft