Matthew Nistico wrote:
1. Since the intake duct will be mated with a more-or-less firm seal to the oustide air kit on my woodstove, then the total length of this duct is added to the total drag on the airflow through the system. Even though my conventional woodstove will likely produce more than enough draw to overcome the added drag - since afterall my woodstove will be blasting 400+ degree exhaust up the chimney - more drag is still more drag; it is still a drain on the efficiency of the system. So why use a "corrugated" dryer vent when I could use a much lower-drag smooth rigid metal duct instead? In the future, when and if I mate this system to my RMH, this should prove even more critical, right?
2. Along those same lines, I understand the importance in RMH design to maintain a consistent cross sectional area at every stage of the air channel through the heater, from beginning to end. As I understand the physics, this is to ensure consistent air flow. Otherwise, the air flow capacity of the entire system would be effectively reduced to the capacity of the single narrowest bottleneck anywhere along its lenght, right? Surely the same logic applies to air flow through my woodstove system (right?). So if that is the case, why attach a 4" intake air duct to a woodstove with a 6" exhaust pipe? And again, even if the woodstove has the draw to power through this restriction, wouldn't this become even more of an issue when attaching to the RMH in the future?
Thoughts, reactions, criticisms, suggestions...?
Ernie Wisner wrote:the little 4 inch intake cant provide the amount of air your fire needs to burn clean in a 6 or 8 inch RMH. it does not need to be smooth for an intake but it does need to be large enough.