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Re: [Aroid-l] Heaters

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 or self-contained heating units.
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