For more information on these options, please see the installation and operation manual (PDF):

Click on the image above to view this manual (PDF)

Here are the certified engineering drawings for the standard single leaf blast door:

Click on the image above to view this document (PDF)

Heavy duty pull handle and discontinued lock shroud - we now offer a deadbolt system

Massive hinges with grease zerks and bronze bearings

This is a tested and proven, pre-hung, explosion resistant blast resistant door that offers excellent protection from the extremely high pressure blast waves produced by a large conventional or nuclear device detonated in close proximity to your shelter.

This door features a compression seal between the door and the frame allowing for the use of a positive pressure NBC filtration system inside the shelter. The inside cam latches suck the door into the seal on the door frame as they are rotated.

The standard sizes are 32 by 72 inches and 36 by 80 inches. These dimensions are the outside of the frame lips that insert into the opening in the wall. You need to make your wall opening a little larger that these dimensions. We have also built a lot of custom sized doors. If you have an existing opening that needs a blast door, please contact us.

This door is designed to bolt to the wall with high strength concrete wedge anchors - after the wall is poured and has cured. This drastically eases installation time and cost. If you choose the assault resistant cam latches, you also get the wall capture brackets - which give you the security of a poured in place door with the ease of installation of a bolt on door.

By utilizing a 5 sided steel envelope for the concrete, we put the steel right where it does the most to resist blast pressures. As the door flexes inward, the inside skin is under tension - resisting deformation. This construction affords a greater strength to weight ratio than earlier designs that need double the thickness of concrete to give the same pressure protection.

We purposely made this door as nondescript as possible because nothing says "valuables inside" like a blast door that looks like a bank vault. It is shipped to you primered finish so you can paint it to blend in with whatever is around your shelter entrance. See the painted blast door with the mirror on it below that is mounted inside a home. The mirror also hides the viewing port built into the door.

All of the seemingly small, but very important details are engineered into this door:

• There are 4 different frame options to handle any type of threshold you have - flat or step over. See page seven of the manual for detail drawings of these options.
• The door is constructed with an envelope of 3/16 inch steel plate - but after you hang it in place, you fill it with concrete - no forms necessary - the skins are in place. This construction method keeps the door relatively light for installation - and once it is filled with cured concrete, it has a lot of dense mass between you and whatever fallout is outside your shelter. It also helps to prevent anyone from using a cutting torch to gain access through the door because concrete doesn't "burn."
• The massive hinges have 1.375 inch shafts captured by bronze bushings that are packed with grease - and they feature grease zerks so that you can keep them lubricated for smooth, effortless opening of the finished weight of 2,100 pounds. The hinges alone weigh 30 pounds.
• There is an optional one-way viewer built into the door so you can see what is happening outside.
• The door has been engineered to withstand a "rebound load." That is a vacuum force sucking the door outward right after the blast wave passes over. A detonation blasts all the atmosphere outward from the epicenter, creating a vacuum. This vacuum can be as deadly as the high-pressure blast wave. That is why our blast doors have the rebound load rating and our automatic blast valves are double acting.

For more information, please see the installation and operation manual (PDF).