In general, a fan net cover (also known as a finger guard, fan grill, or fan cover) is an HVAC component that provides a physical barrier around spinning fan blades to prevent accidental contact with fingers or other objects. Fan shrouds are usually made of wire or plastic and are designed in such a way as to maximize airflow while minimizing noise.

A top coat helps prevent corrosion on the fan. The rate of corrosion for any application is largely dependent on the concentration of the fume, temperature, and associated moisture content.

There are seven of the most common reasons for putting a protective coating on fans, especially on fan shrouds. These reasons are:

1) Anti-acid and alkali corrosion

2) Resists weather elements (rain and UV rays)

3) Protects against abrasion and physical wear and tear

4) Prevent process contamination

5) Protective coating provides an easy-to-clean or decontaminates surface

6) Good aesthetics

7) Safety (fire protection, low glare, visibility)

While coatings are incredible for fans in general, it's still worth noting that there are some limitations to coating fans. These restrictions are as follows:

Bearings cannot be placed in corrosive air streams.

Coating variable inlet vanes and outlet dampers is not recommended as it is almost impossible to properly protect certain parts of them such as connecting rods, bearings, etc.

Various types of shaft seals are available and should be used. In some cases, special types of seals may be required.

Belts and shaft guards are usually made of lightweight materials. Steel blasting can deform these parts. Therefore, steel blasting (and special coatings that require steel blasting) are not recommended for these parts.

Belt and shaft guards are typically painted OSHA yellow.

Drains, especially when dealing with wet conditions, are essential.

Zhejiang Hanjun Metal Products Co., Ltd. is a stainless steel shelves manufacturer, specializing in fan net cover,  kitchen and bathroom racks.