It looks like the test shows the 45 Blower with better performance than the 47. I don't understand how that could be, with everything else being equal? I have 2 TM's. One has the 45 blower driven by a 20 HP Kohler engine and then my Cleanco PTO has the 47 blower. The Cleanco has significantly better suction than the other, while using the same 2" hose to a Devastator in line filter. Maybe the graph is labeled wrong? How about a 56 blower? Are we then to believe the performance goes down still? I don't think so. The Clean Machine
Russ;
All the machines we tested were built by the same company.
The #45 blower has 2" hg. more lift available, compared to the #47 blower.
All blowers in our testing were preset at the maximum recommended by the blower manufacturer.
With the Gardner Denver blowers we were using,
that max. would be 14" hg. for the #36 & #47,
and 16" hg. for the #45 blower.
The #56 also has a 16" hg. max,
so it would outperform the #45 blower.
Your 20 HP with the #45 should be set @ 2" higher lift,
than your #47 PTO for best performance.
Larry
P.S. Testing was done with 25 carpet cleaners watching preliminary testing and recording actual testing on the carpet.
How many equal scientific tests have you seen with 4 different blower systems run side-by-side.