Yes. The foam tubes inside the Double Draft Stop can be cut to any size. Once the tubes are back in the case, the loose ends can be folded over to accommodate narrower doors and smaller windows.

The Double Draft Stop is not rigid enough to prevent all bugs from crawling under the door. A better solution in this situation would be an Aluminum and Vinyl Door Sweep that attaches to the bottom inside of the door.

The fins on the 1 in. x 36 in. Brown PVC Door Bottom Replacement for Stanley Steel Doors will cover up to a 1/2" gap under the door.

Sweeps are fairly simple to install, take a look at the threshold video, or download the instructions.

A majority of Door Sweeps should be installed on the inside of the door, since most entry doors are "in-swinging" doors. A door sweep attached to the outside of the door would be only be used for an "out-swinging" door. A good rule of thumb: you don't want the door sweep to cross the threshold when the door is in motion.

Use 1/8 inch drill bits.

First, soak the Vinyl Insert in a tub of warm (but not hot) water, with just a drop of liquid soap, for about 10-15 minutes. This will make the Vinyl Insert more pliable and easier to work into the threshold grooves. Once the Insert is warmed up, it should be pliable enough to slide into the threshold groove with no problem. If the insert is just being stubborn, a plastic putty knife or plastic spatula can help guide the insert into the grooves for a snug fit.

It's Easy. Take a look at the instructions here... threshold label instruction Or you can watch the Handy Guys install a new Threshold, here.

The Replacement Door Seal for Kerfed Mill Doors, is a replacement for the Kerf seal that should already be in the door jamb or if it is missing there should be a kerf cut into the existing door jamb to accept this product.