How can I hang my fan?

So my grow box's walls are quite thin (I used what was available to me at no cost). The problem is I don't know how I'm going to hang my inline fan.

Because the walls are so thin, I can't screw into the walls as they won't support the weight of the inline fan. The fan is maybe 5 pounds (I'm guessing).

How can I hang my inline fan? I need some kind of clamp or a way of securing the inline fan.

Please help this is an emergency.

How about a few pics of the fan and grow room ? Need to see what you have to work with .

you can take a few of those screws out the top of fan and find a old strap cut it about 4 in long ,screw strap back onto fan and it should be able to use zip ties from there to hang it ,this method has always work for me and it also stops some of the vibration of the fan

Thanks for the suggestions guys. I'll try it out. If I need any more help, I'll post another message. Cheers.