[12Ounce]

Yes, there is room ... better for skinny folks tho. Because of the shape of the plenum, it is more effective to place the caulking on the secondary side of the ac coil ... the same side as the heater coil and the blend door ... you will agree once you are "in there" and see the situation. In my case, some of the old insulation was still hanging loose, danging in the air stream and not achieving anything ... I just broke it away, cleaning up the ac coil periphery as much as possible before installing new caulking.

My blend door was removable because I had already cut an access way into the plenum and done the blend door fix a few years ago ... as outlined in other postings. But for this particular insulation repair, just propping the blend door "up" would work just as well.

The "Mortite" rope caulking is easy to work with; much like modeling clay. It must be forced deeply into place around the outside of coil if one expects it not to later come loose.