You might also try another type of industrial/commercial positive displacement blower that can fit under a blower cover with the same threaded connections called a regenerative blower which consists of single phase 120 volt,single & three phase 208-240 volt models.

I've just found a source for Thunderbolt Roots blowers that also use the same type & size of this blower. The type of equipment that uses this blower is known as truck mounted carpet cleaning equipment. In fact,I once saw in person this type of equipment using the same blower that have the same ...

Found another siren in Mountain View,OK. in Street View.
Besides the Thunderbolt 1000T on Main St. & 4th St.,I found a yellow eight or nine horn Sentry 3Vxxx,
or 7Vxxx. on 5th St. between Randlett St. & Rainy Mountain St.

An idea came to mind about dual motor sirens being mentioned. If the dual motor sirens are single tone with one chopper for each motor,I'm thinking such sirens could be made dual tone by connecting each of the two motors to a variable frequency drive if the siren uses AC induction motors which VFD's...

I'm wondering what would a T-Bolt blower would sound like in the UK or any country using 50HZ AC instead of 60Hz AC assuming the pitch of the blower sound would be lower?

Send them some T Bolt decals to put on the rotator,I assume the decals with the circle F logo or T Bolt decals with either the intertwined snake F or the block FS logo depending on your choice of suggestion

Mountain View-Thunderbolt 1000T 321 Main ST. behind FD

The 5/6 Thunderbolt 1000T in Mountain View,OK still in use & chopper still set on 7 (240 volts). Still less than 100 feet across the street from the grade school I went to. After recess at the usual daily time they tested it,it would either startle me or sometimes would be unbearable to hear reg...

This is a Christmas Eve topic since tonight is Christmas Eve. Because most people now are tracking Santa as I speak, I have an idea of sounding the sirens of a short interval or short blast or in some way to announce that Santa is about to arrive in your area along with an announcement that sirens w...

Is this a Sentry 5V or 3V8? I posted this on You Tube early last month after visiting the powwow in Kinder,Louisiana
http://www.youtube.com/watch?v=lkyHYZ1w6R8