Hole size for gas locker ventilation

[Adam1991]

Hi, our gas locker is not in use yet as it needs ventilation drilled through the hull.
 

Can anyone advise what size of holes are adequate for ventilating a gas locker? Is it a set size or is it worked out based on area etc? 
 

thank you.

Adam 

[MtB]

The size depends on the size and the number of gas bottles in the locker.

 

The BSS site gives you full details.

 

 

[springy]

IIRC the BSS specifies the size according to the size and quantity of bottles to be stored in the locker, and remember its a "Drain" (gas is heavier than air) and if you drill as close to the bottom plate of the locker as you can, you may also need to use a file or die grinder to widen the bottom to create a half moon shape and get the bottom of the drain hole flush (as far as possible) with the bottom of the locker.

 

springy

(beaten to it by MtB)

[Tracy D'arth]

Most seem to be a 20mm hole or there abouts at the lowest possible place.

I have never seen a BSS examiner measure the hole, if there is one they will pass it is my experience.