American Safe Room manufactures this riser blast hatch designed to be installed on an underground shelter. It features an integrated riser that can be ordered in custom heights to match the backfill depth of the shelter.
It is designed to be bolted down onto a shelter top with included concrete wedge anchors or welded to a steel shelter.
It features plasma cut mounting slots instead of round holes to allow movement in two directions for easy positioning on the wedge anchors.
82 PSI pressure rating
The blast lid is constructed from ASTM A-36 steel plate reinforced by stress resistant steel angle pieces. It is designed to withstand an 82 PSI blast load. This professional engineer's stamped certification is for the blast lid stiffeners.
Rotating cam latch
The inner cam latch is the same one we use on our blast doors. It draws the blast lid downward, compressing the EPDM seal on the frame lip and drawing the rain lip down over the riser.
The deadbolt can be operated from the inside without the key. Shown is the inside of a riser hatch with the deadbolt operator next to the cam latch. Note the lift strut on the left side with a duplicate strut anchors welded onto the right side so you can install it on whichever side is most convenient.
The massive hinge assembly is the same one used on our blast doors. It features an inch and half steel pin, bronze bushings, and grease zerk's for ongoing lubrication.
This picture shows the back of the riser blast hatch. The optional wide angle viewer port on the back side is just under the hinge. The rain lip on the blast lid is just showing the EPDM synthetic rubber seal and the deadbolt cap is has been removed off of the lock port.
The riser hatch can be supplied with a UL fire rated wide angle viewer strategically mounted on each of the four walls. They are mounted six inches below the hatch. This gives you the ability to see what is directly around your hatch before opening it. The viewers are mounted in heavy duty inch and a half round steel rods that have been bored out, leaving three-eighths wall thickness. These mounts are inserted through the side wall of the riser and welded in place.
Optional escape jack
This 3 ton bottle jack can be deployed if debris falls on top of your hatch. In the stowed position, the top anchor is removed and it rotates down to nest behind the internal ladder. It must be rotated up into position before use - but you do not have to climb a ladder with a heavy bottle jack to affect emergency egress. The red jack is shown here in the deployed, extended position.
Optional internal ladder assembly
The riser hatch may be ordered with a bolt on ladder assembly - shown above next to the jack. This heavy duty steel ladder is rated for 300 pounds. It is built to order, so it fits your shelter with the proper dimensions - the bottom rung is between 6 and 12 inches off the floor, the top rung is 6 inches from the top of the riser, and all the rungs in between are 12 inches apart with the proper toe clearance from the wall. See page five of the manual for ordering details.
Optional external ladder
The riser hatch can be ordered with a removable above ground extension ladder for assistance and added safety for personnel entering or exiting the shelter. It fits into a socket welded onto the outside of the riser and is retained by a pin on a lanyard. It is lightweight and can be stowed inside the shelter and installed before climbing out.
It is shown installed in its socket on the outside of the riser to the left of the emergency escape jack.
The concrete is poured around the hatch, sealing it in place.
Note that the ventilation pipes are also poured in place.
The hatches are shipped by LTL freight. We can specify that the delivery truck has a drop gate so the delivery is on the ground exactly where you want it. You must ensure that there is adequate turn around room.
Shown is a riser hatch on a flatbed for use with our shelter kit.
American Safe Room provides free air filtration and component blast protection shelter consultations. Contact our Sales Manager at 541-459-1806 or send a plan view drawing of your shelter to sales@AmericanSafeRoom.com or FAX it to 503-212-6695.
Telephone 541-459-1806 or e-mail