Here's what I can find:
Allertor 125: Overall assembly is 7 feet long, 3 feet wide, and 5 feet tall
Source:
https://www.manualslib.com/manual/15770 ... selected=1
P-10 and P-15
36 inches x 36 inches x 40 inches
Source:
https://www.dropbox.com/sh/vbrhaaxqnmmk ... tracking=1
P-50
8 feet long, 6 feet wide, 8 feet tall
Source:
https://www.dropbox.com/sh/bexk35cv5ov2 ... al+(1).pdf
Hurricane Mk. II
Head & horn: 82" long by 54" diameter
Blower: 38" wide, 40" deep
Source:
http://www.civildefensemuseum.com/siren ... 30_MK2.pdf
Hurricane 130:
Head & horn: 72" long, 11" to 26" wide, 48" tall
Blower: 51" long, 24" wide. 18" tall
http://www.civildefensemuseum.com/siren ... Manual.pdf
Cyclone:
Diameter at widest point: 44 inches
Height: 55 inches
Source:
https://www.dropbox.com/sh/vbrhaaxqnmmk ... tracking=1
There should be diagrams of the sirens and their parts contained within the manuals.
These are all the manuals I could find at this time. Someone out there will for sure have the info on the Banshee, Screamer, etc.