Several types of fences are appropriate for playgrounds including wooden fences, vinyl fences, metal fences and chain-link fences. The selection of a suitable type of fence depends on factors such as the desired aesthetic, budget, and durability.

1. Wooden fences: This type of fencing offers a classic aesthetic. It is easy to customize to match the playground theme. However, it needs regular maintenance like sealing, staining, or painting to prevent decay. Moreover, sharp points and splinters could be a potential hazard.

2. Vinyl fences: These fences are an excellent choice due to their durability, strength and minimal maintenance. They also come in a variety of colors and styles. On the downside, they tend to be more expensive and could potentially break under high impact.

3. Metal fences: They are highly durable and require very little maintenance. Aluminum or iron fencing can also be designed with decorative elements for an appealing look. However, they can heat up in sunny conditions and might burn children’s hands.

4. Chain-link fences: This type of fencing is affordable, durable and provides visibility. The gaps, however, could pose a danger as children could potentially stick their hands or heads in them.

In terms of height, it is generally recommended to have a minimum of 4 feet for preschool-age children and 5 feet for school-age children. The fence should also not have openings that are large enough for children to pass through.

“Safety is the paramount concern while choosing the playground fencing. Sharp corners should be avoided, and fence installation should be strong enough to prevent accidental topples. For public playgrounds, it might also be necessary to ensure that the fence conforms to local building codes.”