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Special Finishing

Galvanization

The majority of fans can be subjected to a hot dip galvanization, although with the following limits:

large size fans that are usually constructed with a single body must be disassembled into several components to allow immersion in the galvanic baths;
high-pressure and very close-bladed impellers tend to become clogged with zinc, thus preventing subsequent balancing;
very lightweight structures and light gauge sheet steel impellers will become deformed in a hot dip galvanization bath;
in impellers with integral hub (series Z…) the bore becomes clogged with zinc;
N.B.The appearance of a galvanized fan may be irregular due to the direction of immersion; in addition, the chassis must have the drain holes necessary to make it compatible with the hot dip process. The impeller hubs are painted and assembled to the pre-galvanized impellers; the next stage in the process is balancing, wherein the balancing weights are welded to the impeller;
protective casings made of light gauge sheet steel tend to become distorted and it is therefore preferable to purchase them pre-painted or treated by means of a cold zinc coating system.

Stainless Steel

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The standard treatment for stainless steel fans up to size 710 consists of micro shot blasting; alternatively, the fan can be painted. For all other fans the treatment consists of external painting, with optional micro shot blasting; hybrid fans with parts in carbon steel and parts in stainless steel are painted. The standard colour for fans made entirely or partly of stainless steel is RAL9007.