fan still looks like its gonna be too strong for when they start to grow if you plan on keeping it there, i have my 12'' oscillating fan aim at a corner in my closet and it circles around the whole closet cooling and making a perfect light breeze. Get that tinfoil out if thats what that is, it can burn your plant. Your white wall will be fine if you dont wanna get mylar. And you might wanna check the humidity. Temp should be fine since its just some fluoros. What do you plan on using when you flower? I wouldnt worry about cleaning the air for smell n such yet, wont need that till flowering. And you might wanna check the humidity. Im a week into flowering and still dont have a smell to cover up. You have a good closet like I do, check mine for ideas friend.