The goal of this randomized control trial is to learn if box fans and filters can reduce asthma symptoms and improve indoor air quality in children ages 6 - 17 years old with asthma living in the Duwamish Valley, Seattle, Washington. The main question it aims to answer are:

• Do box fans with filters improve asthma symptoms?
• Do box fans with filters improve an objective measure used to monitor lung function known as forced expiratory volume during the first second (FEV1)? Researchers will compare children living in households with high quality filters to those in households with sham filters to see if air quality and asthma symptoms improve.

Participants will

• fill out several questionnaires
• monitor their lung function with a peak flow meter
• place an air monitor in their homes to monitor indoor air quality
• run the box fan when they are at home

Inclusion Criteria:

• age (6-17 years)
• poorly controlled physician diagnosed asthma defined as more than four days with asthma symptoms in the past two weeks, use of asthma rescue medication for more than four days in the past two weeks, or health care utilization due to asthma in the past year (hospitalization, emergency room visit, or unscheduled clinic visit)
• living in Georgetown and South Park neighborhoods of Seattle

Exclusion Criteria:

• children with unstable housing or shared custody arrangements

Only de-identified individual level data sets will be shared. Given the small sample size of our study, we will protect against deductive disclosure by withholding information that could result in disclosure.

We will also require interested investigators to provide a proposal that will outline their study question and analytic methods. If there is any overlap with ongoing manuscripts, we will ask investigators to collaborate with ongoing efforts or to propose an alternative study question. Investigators will be required to sign a data sharing agreement that will include assurances about participant privacy and data confidentiality.

We do not anticipate a great number of requests for our data so will handle them on an individual basis. After discussing the data with investigators who are interested in accessing it, we will share it via a secure site.

Health data from our randomized control trial will be shared with interested investigators after the two main results papers from the study have been accepted for publication (one on asthma outcomes and the other on air quality). Since data collection will not be finished until year four of the study and the analysis and writing will take some time, data sharing will likely occur after the grant period has ended.