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This heater duct is blowing directly on the concrete. It is causing moisture which is bringing what looks to be a mold-like substance to surface or is it efflorescence? Testing can tell.
Mold or Efflorescence?
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This heater duct is blowing directly on the concrete. It is causing moisture which is bringing what looks to be a mold-like substance to surface or is it efflorescence? Testing can tell.
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