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as far as I know it works like this...
- both read 0v-5v
- but at 5v on the Z32 AFM it is actually flowing more air than a R32/R33 AFM at 5v.
The only benefit is that the AFM is able to read more air flow - it's not bigger.
The Q45 is a bigger AFM (82mm??) but I'm not sure of what flow it can read.
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