Please assess the completion status of the following clinical trial:

Trial Title: Health Effects of Indoor Air Filtration in Healthy Chinese Adults

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Healthy university students in Jiangwan Campus, Fudan university~* Non-smoking, no history of alcohol or drug abuse~* Free of chronic cardiovascular, respiratory, liver and kidney disease~* Spend at least 50% (weekdays) or 80% (weekends) of time indoors~Exclusion Criteria:~* Current or ever smokers~* History of asthma, chronic bronchitis，cough, hypertension or other chronic inflammatory disease~* acute infections~* medication use in recent one month

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 30 Years
- Healthy Volunteers: t

Study Arms:
- Air purifiers (Type: EXPERIMENTAL): Participants in this group received an intervention of true air purifiers placed in the center of the room.
- Control (Type: SHAM_COMPARATOR): Participants in this group received an intervention of sham air purifiers, which were under the same conditions as the true purifiers except the filter gauze in them were removed.

Based on this trial design, predict the completion outcome and termination type (if applicable).