Product Overview | Hot Air Blowers
FEATURES — Steel housing and impeller(s). — Heat slinger and heat shield.* — Single width inlet and outlet. — Drain plug in housing. — Motor specs: TEFC with 1.15 service factor.
Altitude and preheated air affect blower ratings--pressure, capacity, and horsepower. For blower selection/performance at altitudes significantly above sea level, refer to the blower section of the North American COMBUSTION HANDBOOK. Generally, standard motors can be used up to 3300 feet elevation; special construction is recommended above 3300 feet.
CONSTRUCTION
Class B design with Class F insulation. Extended shaft with keyway. 60Hz.
Heavy gauge fabricated steel housings, steel bases, and steel impellers are standard. Stainless steel is available. Impellers are precision balanced by North American for smooth, quiet operation. Every blower is factory tested for pressure and volume, and a written record of its test performance is permanently kept by North American . Specific information about a blower manufactured 20 years ago--which occasionally is sought when an impeller requires replacement, or other maintenance is needed--can be furnished via serial number of the blower and its record in Cleveland files.
* A carbon steel heat shield is installed on the inner housing, and a heat slinger is used on the shaft between blower and motor or fan end pillow block.
Standard North American blowers can be used with inlet air temperatures up to 200°F. Beyond this point, it is necessary to substitute steel for aluminum, and to protect motor and motor bearings (or pillow block bearings) from excessive heat. 2600 Blowers handle hot air or flue gas up to 600°F maximum. They are particularly useful as exhaust fans in TwinBed II TM Heat Reclamation systems. Used as exhaust fans, blowers develop less suction than would be equivalent to their pressure ratings. These blowers hold nearly constant pressure while delivering any volume within their rated capacity range. Their most common function is to supply combustion air to industrial furnaces and kilns. They also are useful for conveying, drying, pressurizing, and other pneumatic applications. The 2600 series is premium quality in performance, construction, low noise level, and longevity. Unless subjected to physical or environmental abuse, a 2600 Blower will last indefinitely even when operated continuously--its motor may require service occasionally (dependent on ambient conditions).
SELECTION
2600 Series Hot Air Blowe r
Pressures and capacities are shown on succeeding pages of this Bulletin. While motors with 1.15 (115%) service factor are more and more available (even in TEFC construction), it is wise to allow some capacity safety margin when picking a blower for a calculated cfh requirement--unanticipated piping leaks, variations in burner capacity, and other unforeseen factors could cause motor overload unless there is some cushion. Without prior knowledge of leakage and other conditions, a 10% safety margin is considered minimum. Also, it is important to allow for pressure losses in piping, fittings, and valves, which reduce pressure available at the burners (or other end use).
Select correct discharge position when ordering to avoid changes in the field.
Standard discharge positions (viewed from motor side).
Bulletin 2600 Page 2
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