Best way to hook up a ventilation system from small grow tent to larger grow tent

I have a 3 x 3 grow tent and looking at a 1.8ft x 1.8ft growtent to store mothers. Can I put a fan in the small tent and hook it to my larger tent some how? Thanks

4"duct with a pc fan blowing the hot air out.

Im thinking this will raise the temp in your 3x3 tent.