| [GMCnet] CFM for AC Blower and Mod to the System?? [message #125091] |
Sun, 08 May 2011 15:01  |
Arthur Mansfield
Messages: 290
Registered: April 2010
Karma:
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Senior Member |
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I am trying to understand the engine AC system. I have found the schematic for the vent system. I am thinking about using the modification where they adding two additional event from the front of the AC box like others have done (I will be using 3 inch instead of 2 inch). I was going to add an in line blower in each line of 165 CFM each (http://replacementboatparts.com/3bilgeblower.aspx). So I was wondering what the CFM was for the blower in the AC box rated CFM. I could add 225 CFM if that is required but then I have real space problems. Each added blower will be controlled by a variable resistant switch which is rated at 3 times the current draw for the motor. Not sure the switch I am planning to use will work for motor controller (http://replacementboatparts.com/switchesandbreakers.aspx).
Assuming loses the 165 blower would give about 12 ft per sec air flow from a 3 inch vent with no air flow from the air box. This would replace the air in the RV about once every 6 minute assuming some loses. The air flow should be better than that since there will pressure on the in line motor. Those who use this set-up with the in line bower have good air flow thru a 2 inch line but require extra cooling on real hot days. So I am hoping the in line would add enough flow to cool the RV even on hot days.
What would happen if I blew back into the vent system where I could enter from the front side where the air comes in from the vent system (back side in my definition). It looks like it would work for the passenger side but not for the drives side.
Has anyone tried this type mod on adding in line blowers. This would allow some separate control on each side as to how the blowers are set.
Art & Doris
76 EL
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