What are dead space volumes for the NorCal false bottoms by kettle size?

10 Gal Kettle: 0.7 Gals

15 Gal Kettle: 0.9 Gals

20 Gal Kettle: 1.2 Gals

30 Gal Kettle: 1.6 Gals

13.5625 x 1.125 calculated is 162.53 CI or 0.7035 gallons

15.6250 x 1.125 calculated is 215.72 CI or 0.9338 gallons

17.6250 x 1.125 calculated is 274.47 CI or 1.1881 gallons