Entrance width 126cm
Entrance height when venting 30cm
Maximum entrance height 68cm
Inner depth 60cm
Inner height 120cm


The ventilation performance of the hood we use is 100 fpm, and it is a variable air velocity (VAV) hood that always maintains 100 fpm depending on the area of ​​the hood window opening.

First, the volume inside the hood is 907,200 cm^3.

When all the liquid butane of the current piston is discharged, the expanded gas volume is 17,947 cm^3.

When all the liquid butane of the piston being designed is discharged, the expanded gas volume is 74,776 cm^3.

Since the internal volume is about 50 times larger than the existing one and about 12 times larger than the later one, there is no leakage at all when the hood is closed.

The air ventilation speed inside varies depending on the degree of window opening.
When venting, since the experimenter opens the valve by hand, opening the window about 30 cm will not interfere with the movement of the arm, secure a field of vision, and properly protect the experimenter's respiratory system.

At this time, the volume of gas vented per second according to the window open face is 192,024 cm^3.
In the case of the current piston, the vented butane is completely vented in 0.09 seconds.
In the case of the future piston, the vented butane is completely vented in 0.39 seconds.

We can conclude that it is a very safe condition.