Propane Heater Causing Bud Blast?

[jmrathbun]

A friend tells me he sees a lot of bud blast on his phals, especially in the winter months. The room has an unvented propane fireplace with a slight chemical odor when he first lights it. Could toxic gasses from this heater be causing his problem with bud blast on phals? He says they keep a window cracked for ventilation.