When a mold is not available, we use air to blow the dome through a blow ring. This is called free-blowing.

Using blow rings allows us to manufacture domes in depths ranging from 1″ up to nearly 1/2 of the domes diameter.

(Example: A 20″ Dia. dome can be free-blown up to approx. 9.75″ deep)

Select a size based on the outside diameter of the dome.

All sizes below are listed in inches.

4 14.250 20.500 30.120 49.430
4.50 14.500 20.750 30.500 49.750
4.62 14.620 20.870 30.750 52.060
4.93 14.680 21.000 31.000 52.120
5.000 14.750 21.250 31.370 52.620
5.620 14.870 21.500 31.500 53.000
5.930 14.930 21.750 32.000 53.500
6.000 15.000 22.000 32.250 54.000
6.250 15.120 22.187 33.120 54.250
7.000 15.180 22.250 33.750 55.250
7.120 15.280 22.500 33.870 55.813
7.930 15.500 22.930 34.000 56.000
8.000 15.750 23.000 34.500 56.280
8.250 15.870 23.180 35.000 56.750
8.813 15.930 23.250 35.500 57.500
8.500 16.000 23.370 35.688 58.000
9.000 16.180 23.500 36.000 58.250
9.120 16.250 23.560 36.250 58.500
9.250 16.370 23.750 36.280 59.000
9.930 16.430 23.930 36.560 59.250
10.000 16.500 24.000 37.000 59.750
10.120 16.750 24.120 37.370 60.000
10.500 16.930 24.250 37.500 60.500
10.620 17.000 24.430 37.750 60.750
10.750 17.180 24.500 37.870 61.500
10.870 17.250 24.750 38.000 63.000
10.930 17.430 24.870 38.430 64.000
11.000 17.500 25.000 38.500 65.870
11.370 17.560 25.250 39.250 66.000
11.430 18.000 25.500 40.370 67.625
11.500 18.120 25.750 40.500 70.000
11.620 18.180 26.000 41.500 72.000
11.750 18.370 26.250 42.000 72.250
11.870 18.500 26.370 42.120 78.250
12.000 18.680 26.500 42.250 80.500
12.060 18.750 27.000 42.500 81.250
12.120 18.810 27.250 43.125 82.250
12.250 19.000 27.430 44.000 83.370
12.500 19.120 27.620 44.500 84.250
12.870 19.180 27.750 45.370 85.440
12.930 19.250 28.000 45.625 86.000
13.000 19.500 28.180 45.750 90.375
13.500 19.620 28.500 46.000 91.000
13.560 19.750 28.750 46.500 92.000
13.620 19.813 29.000 46.750 96.250
13.750 19.870 29.250 47.000 97.000
13.870 20.000 29.370 47.500
14.000 20.120 29.500 48.120
14.120 20.370 30.000 48.370