In message , Clive
George writes
"geoff" wrote in message
...

So what, without looking it up, it the explosive concentration for mains
gas ?

No peeking, if you don't know, take a guess ...

CH4 takes 2 02s, air is 1/5 02, so how about 10:1 air:gas?


8% - 18% is the official explosive concentration, so yes, you are
within the limits there


--
geoff