A public housing tenant penalised for littering and throwing objects from a height fought an eviction order yesterday. The tenant, who lives at Yau Oi Estate in Tuen Mun, argued his case at a Housing Authority appeal panel. He scored 17 demerit points because of his behaviour and was ordered to move out of his subsidised unit early this year. The outcome of his appeal will be known in about 14 working days. It is the third challenge against the authority's two-year-old marking scheme, which is designed to keep subsidised blocks clean. Under the scheme, introduced in the aftermath of the Sars outbreak, tenants are given five demerit points for littering and seven for spitting or throwing objects from a height. Tenants face eviction if they accumulate 16 points within two years. Although four tenants have scored more than 16 points, no one has been evicted so far. Last month, the panel overturned the eviction of a tenant who was ordered to leave after accumulating 17 points for littering and spitting. He was allowed to remain at the public housing estate if he did not commit any more of the offences banned under the scheme. The first tenant who faced being thrown out is now safe from eviction. He passed the one-year suspension without committing new offences. One tenant facing eviction for keeping a large amount of waste in his flat has an appeal pending.