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The Kirk & Blum one-piece duct 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 duct 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 Elbow Ducts - Air Tight
This duct elbow is the same as the duct elbows above, except it is welded on the back to make it 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" |
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