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One Piece
The Kirk & Blum one-piece elbow is fabricated from a single piece of galvanized sheet steel formed by a special machine. Centerline radius is either 1 1/2 or 2 1/2 times the elbow diameter. (Except 13" thru 15" on LR: CLR = 2xDIA.) The elbow is not airtight.
DIA. GAUGE SHORT RADIUS LONG RADIUS
45° 60° 90° CLR 45° 60° 90° CLR
Wt. Lbs. Wt. Lbs. Wt. Lbs. Wt. Lbs. Wt. Lbs. Wt. Lbs.
3 22 0.6 0.8 1.0 4 1/2" 0.7 1.0 1.4 7 1/2"
4 22 1.3 1.6 2.2 6" 1.6 2.0 2.8 10"
5 22 1.7 2.1 3.0 7 1/2" 2.1 2.7 4.0 12 1/2"
6 22 2.4 4.1 4.1 9" 3.0 4.0 5.8 15"
7 22 3.3 5.0 5.5 10 1/2" 4.1 5.3 7.7 17 1/2"
8 22 3.6 5.8 6.7 12" 5.8 6.3 9.4 20"
9 20 6.6 8.4 11.4 13 1/2" 8.4 10.9 15.6 22 1/2"
10 20 7.9 10.0 13.5 15" 9.9 12.9 18.3 25"
11 20 10.1 12.0 16.7 16 1/2" 12.4 15.1 22.8 27 1/2"
12 20 11.5 13.5 19.6 18" 14.5 17.6 27.0 30"
13 20 13.9 17.8 22.8 19 1/2" 15.1 20.7 28.5 26"
14 20 15.0 19.7 25.9 21" 16.8 22.2 30.5 28"
15 20 17.4 24.6 31.3 22 1/2" 19.6 26.8 35.7 30"

Welded Elbows - Air Tight
This elbow is the some as the elbow above, except it is welded on the back to make if AIR-TIGHT. Size range is the same. (Except 13" thru 15" on LR: CLR= 2xDIA.)
DIA. GAUGE SHORT RADIUS LONG RADIUS
45° 60° 90° CLR 45° 60° 90° CLR
Wt. Lbs. Wt. Lbs. Wt. Lbs. Wt. Lbs. Wt. Lbs. Wt. Lbs.
3 22 0.6 0.8 1.0 4 1/2" 0.7 1.0 1.4 7 1/2"
4 22 1.3 1.6 2.2 6" 1.6 2.0 2.8 10"
5 22 1.7 2.1 3.0 7 1/2" 2.1 2.7 4.0 12 1/2"
6 22 2.4 4.1 4.1 9" 3.0 4.0 5.8 15"
7 22 3.3 5.0 5.5 10 1/2" 4.1 5.3 7.7 17 1/2"
8 22 3.6 5.8 6.7 12" 5.8 6.3 9.4 20"
9 20 6.6 8.4 11.4 13 1/2" 8.4 10.9 15.6 22 1/2"
10 20 7.9 10.0 13.5 15" 9.9 12.9 18.3 25"
11 20 10.1 12.0 16.7 16 1/2" 12.4 15.1 22.8 27 1/2"
12 20 11.5 13.5 19.6 18" 14.5 17.6 27.0 30"
13 20 13.9 17.8 22.8 19 1/2" 15.1 20.7 28.5 26"
14 20 15.0 19.7 25.9 21" 16.8 22.2 30.5 28"
15 20 17.4 24.6 31.3 22 1/2" 19.6 26.8 35.7 30"