What is the proper procedure for sizing the power venter on an oil fired appliance?
When selecting a power venter for an oil fired appliance you must size the power venter to the maximum input GPH (gallons per hour) firing rate at the standard 100-psi pump pressure of the appliance. You would not want to size the power venter to the BTU rating of the appliance, since oil has a higher sulfuric acid content in its flue gas. The power venters have two columns on the sizing chart, one is GPH for oil, and the other is a BTU rating for gas appliances.