Sheet Foam - 10" x 4" x 5/16" (10 Piece) (SKU: Foam-10-4)

This is a Synthetic Polyether Open-Cell Foam with a 3M peelable adhesive. Our Foam Seal We use open cell foam to seal our doors.  Most factory open cell foam is a polyester based foam that is biodegradable, which is why it comes apart and blows out of the vents.  Our foam is a synthetic polyether based foam that is not biodegradable and therefore will not deteriorate like the original foam. A common question that we get here is “Why don’t you use closed cell foam like the other guys?” The simple answer is, we’d love to, but we have yet to find closed cell foam that will perform satisfactorily in an HVAC box. There are a few requirements that foam must meet in order to be acceptable for use on our replacement doors: The durometer or “squishiness” of the foam must be soft enough to sufficiently seal the box. The plastic housings have a very loose tolerance for what can be considered “flat.” We’ve had boxes here that have had as much as 1/4 inch gap on the sealing surface when the door w