Model | Model | Steam Dispersion Tube Length |
Duct Width Minimum and Maximum |
Steam Dispersion Tube Weight |
D-1 | DL-1 | 12″ (304 mm) | 11″ (279 mm) to 16″ (406 mm) | 3 lb (1.4 kg) |
D-1.5 | DL-1.5 | 18″ (457 mm) | 17″ (432 mm) to 22″ (559 mm) | 3 lb (1.4 kg) |
D-2 | DL-2 | 24″ (609 mm) | 23″ (584 mm) to 34″ (864 mm) | 4 lb (2 kg) |
D-3 | DL-3 | 36″ (914 mm) | 35″ (889 mm) to 46″ (1168 mm) | 6 lb (3 kg) |
D-4 | DL-4 | 48″ (1219 mm) | 47″ (1194 mm) to 58″ (1473 mm) | 8 lb (3.6 kg) |
D-5 | DL-5 | 60″ (1524 mm) | 59″ (1499 mm) to 70″ (1778 mm) | 9 lb (4 kg) |
D-6 | DL-6 | 72″ (1829 mm) | 71″ (1803 mm) to 82″ (2083 mm) | 10 lb (4.5 kg) |
D-7 | DL-7 | 84″ (2133 mm) | 83″ (2108 mm) to 94″ (2388 mm) | 11 lb (5 kg) |
D-8 | DL-8 | 96″ (2438 mm) | 95″ (2413 mm) to 106″ (2693 mm) | 12 lb (5.5 kg) |
D-9 | DL-9 | 108″ (2743 mm) | 107″ (2718 mm) to 118″ (2998 mm) | 13 lb (6 kg) |
D-10 | DL-10 | 120″ (3048 mm) | 119″ (3023 mm) to 130″ (3302 mm) | 14 lb (6.4 kg) |
D Series atmospheric steam manifolds, or dispersion tubes, are intended for duct-type distribution.
Where an existing duct system is available, steam is commonly discharged into the duct through a dispersion tube. If the dispersion tube is to be located below the humidifier, install a drip leg with water seal.
NOTE: For all atmospheric units, please consult factory personnel for duct applications with high static pressure (>4″ W.C.) or velocities more than 2,000 FPM. Avoid placing dispersion tubes in downward, high-velocity airflows. Please contact your Armstrong Representative with questions.
NOTE: When applicable, atmospheric humidifiers should be located as close to the air-handling system as possible and never more than 40 feet (12 m) of equivalent pipe away.