Heatboxes for crates

We have had several people inquire about the heatboxes I have on our farrowing crates. They are great for keeping the babies warm and away from the sow and from getting layed on. We usually put them in the box and block the doorway with a brick when they are about 1=2 hrs old and we leave them in there for about 1 hr then remove the brick and let them come out on their own. This teaches them where the heat is and they learn quick. Anyways here are some pics. I m cant seem to get them loaded onto here, so here is the address to our facebook site you can see them there. https://www.facebook.com/home.php?sk=lf#/photo.php?pid=369499&id=1659139515


Thanks

Bo