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il
Number of 90 ° Weather Hood Type
Elbows Recommended Use Only for Short Run Installations
KL-£..
4" 4"
(10.2 cm) (i 0.2 cm)
2-1/2"
(6.35 cm)
Maximum length of 4" (i0.2 cm)diameter rigid metal duct
0 65 ftx_l:(19.8 m) 55 feet (16.8 m)
1 55 l_e| (16.8 m) 47 feet (14.3 m)
2 47 lee| (14.3 m) 41 feet (12.5 m)
3 36 fee_ (i i .0 In) 30 feet (9.1 m)
4 28 feet (K5 m) 22 t_et (6.7 m)
Maximum length of 4" (10.2 cm)diameter flexible metal duct
0 45 l_e| (13.7 m) 35 feet (10.7 m)
1 35 l_e| (10.7 m) 27 feet (8.2 m)
2 30 feet (9_1 m) 21 feet (6.4 m)
3 25 feet (7.6 m) 17 feet (5.2 m)
4 20 feet (6.1 m) 15 feet (4.5nl)
NOTE : Deduct 6 feet (i.8 m) for each additional elbow.
[ Table. 11
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