HANDLING CORROSIVES

Protective coatings, special alloys, and FRP construction are available to combat corrosion problems. Special coatings [up to 12 mil thickness] – special paints and spray coatings are available under a variety of trade names. Canada Blower works with experienced coating applicators who can apply coatings to meet a wide range of requirements. Alternate-material construction–Single-Width Fans can be constructed of aluminum or various stainless steels.

HEAT-FAN CONSTRUCTION

Arrangement 1, 8, and 9 fans can be constructed for elevated temperature operation with the addition of shaft cooler and guard and high-temperature paint for 650°F maximum airstream temperature. Arrangement 9 fans are also furnished with motor heat shield. If optional shaft seal is selected, a recessed cone is furnished. Note that the maximum safe wheel speeds decrease as airstream temperatures increase.

SPARK-RESISTANT CONSTRUCTION [SRC]

Intended to minimize the potential for any two or more fan components to generate sparks

within the airstream by rubbing or striking during operation. The following types are available:

AMCA A [AIRSTREAM] SRC: To  include all airstream parts constructed of a spark resistant alloy... maximum temperature: 200°F.

AMCA B [WHEEL] SRC: To include the fan wheel constructed of a spark-resistant alloy and a buffer plate around the housing shaft-hole opening...maximum temperature:200°F.

AMCA C [BUFFER] SRC: To include a spark-resistant alloy buffer affixed to the housing interior adjacent to the wheel backplate, a spark-resistant alloy inlet cone, and a buffer plate around the housing shaft-hole opening... maximum temperature:650°F.

ALL TYPES SRC: Fan is to be so constructed such that no bearings, drive components, or electrical apparatus are located in the airstream... the user must electrically ground all

fan and system components. As compared to belt drive fan arrangements, direct drive Arrangement 4 fans of all styles, where the fan wheel mounts directly onto the motor shaft, are more compact, require less maintenance, and generally have a lower first cost. However, relative to belt-drive fans, they are limited in application, size, available features,and the ability to adjust performance.