One way to better control of the fan is to add a tee in the air line between the blower (fan) and the burner to split the air into two streams. Install a butterfly valve on the side of tee and use it to divert air away from the burner. Run the blower without throttling the air intake to the blower. The blower will stay cool, and you will have control over air to the burner.
Re the 'yellows' along with the 'eggy' smells could be due to odorizer added to the propane to alert you of leaks. Some regions mandate that gaseous fuels have the odorizer to alert everyone for leaking gas. In the US it is required in natural gas, not sure about bottled propane. The favorite odorizers here are sulfur based. Check your fuel supplier.
Magnolia Mud ResearchMember Since 28 May 2016
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