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sirensandfirealarms
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Re: Port Ratio?

Sat Feb 02, 2019 3:29 am

Jackson95 wrote: ↑
Sat Feb 02, 2019 2:36 am
 There are also sirens that use Single Ratio or triple ratio. But there are no triple ratio sirens has far has I know.
Gents of Leicester built some 4hp 10/12/15 port sirens.
Proud owner of 4 Model As(all in a state of disrepair), a USI siren, and a 16-port rotor from a Sterling M-10.
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