Tranoble, thanks. o.k. re. the scrubber. For yr. info. my co2 gen. and propane bottle will be in a concrete garage 12 ft. from my growroom. So no worries. I don't think the fact that a pilot light generates co2 is a big deal. Ambient co2 in greater or lesser concentrations exists naturally in the atmosphere. IMO the bigger problem with a pilot light is the actual light it gives off in a dark growroom, posing a problem for complete darkness.