oh!
Sorry for the double post I just came across this article from vacumaid
8 central vacuum motor FAQ answered by Ametek
4. What happens when two or more motors are connected in (air) series?
In this arrangement involving bypass motors, the working air exhaust from the first motor is directed to the fan intake of the second motor, providing for a significant increase in the vacuum performance at small orifice conditions with no appreciable increase in CFM. We don not recommend the used of two through-flow motors in a series connection as the heat from one motor is transferred to the second motors creating an overheated situation.
5. What happens when two or more motors are in (air) parallel?
This arrangement usually involves two or more motors mounted in the cover of a large container. Each motor’s fan system is working from the same air space. In this case, air flow (CFM) is significantly increased at a large orifice conditions with no appreciable increase in vacuum.
This is what leads me to believe they just added the numbers on that Galaxie.
[URL unfurl="true"]https://vacumaid.com/8-central-vacuum-motor-faq-answered-by-ametek/[/URL]
