Is a post purge necessary when connecting a power venter to an oil fired appliance?
Yes, the post purge is necessary on the power venter with an oil fired appliance. With an oil fired appliance the flue gases have a higher sulfuric acid content which is very corrosive. Without the post purge the power venter’s motor life will be greatly decreased along with the flue pipe used to vent the appliance. Also, there is a greater chance the flue gases could leak out of the flue pipe and into the house, which could cause sooting and odors in the house.
