Product review (5 stars): Love it, durable, easy to install
Omg, I had to transfer work my dad did eons ago with cardboard, duct tape & a slab of wood. This was ridiculously easy to put in, open window, put in between window space, adjust to size, close window firmly on it. Done! Placing the duct ventilation on it took a tad longer but just flatten out 2 inches, put clasp on loosely, slide duct ventilation in & twist left to right, until I get the amount u want then tighten the clasp.