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From: ted.held at us.henkel.com on 2006.11.22 at 14:26:33(14833)
Two observations:

1. Ethylene is also a combustible gas.
Any traces coming in from a gas line (up to 4% according to my old Merck
Manual) would have to pass through the flame before leaking out into the
environment. If you had imperfect combustion that would threaten such a
happening, I would expect that the carbon monoxide alarm would be triggered
before or simultaneously with any ethylene being notable.

2. Be sure you have your hot air stream
and humidity under control. Even if your combustion exhaust is laden with
water (a combustion product), it is the overall relative humidity that
is important. Dry air will scald. Similarly, plants getting blasted with
the hot air stream will be unhappy. Just like you would. Best to have the
warm air blowing away from plants until such time as it can be mixed gradually
into the hothouse atmosphere. These considerations would apply to exhausted

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