Product review (5 stars): Keeps the cold out!
I love this thing! My husband installed it, then a day later once I entered the laundry room, I noticed how comfy the temperature felt, it actually feels like the room is part of the house, instead of a cold separate room.  I don't know how it keeps the cold out, but it does!

Hubby said easy to install.  It does not come with screws, they assume you will use your existing screws.  Our previous vent was somehow installed without screws.  We used 2 inch exterior wood screws.