Many times customers have concerns about whether or not a frame needs to be lead lined on one side or completely lead lined. Door frames are normally lead lined on the door side of the jamb if the lead in the wall is on the same side of the partition (refer to our Type 1 detail). But if the lead door and the lead in the walls are on opposite sides, then the entire frame needs to be lead lined (refer to our Type 2 detail). This eliminates any risk of a radiation leakage at the stop of the frame if the radiation is emitted from the machine at a direct angle to the door frame. These frames are normally welded and A&L Shielding recommends using welded frames when possible. However, there are instances such as with existing construction where installing welded frames is not feasible. For those occasions, the door frames can be supplied as knock down if the lead thickness is less than or equal to 1/8”. Window Frames normally have lead on the radiation source side of the partition see below.

They are typically fixed welded units, but they can be supplied as a two-piece slip type if the wall must be framed prior to the window frame’s arrival on site or if they are to be installed into an existing partition. Lead Lined Frames can have many of the same anchors as non lead lined frames. See below for some typical anchors for our lead lined frames. Note: Lead is not shown for clarity. The lead thickness required for frames must meet or exceed the shielding requirements as defined by the project physicist. We offer lead thicknesses starting at 1/32” up to 1/2”. Our standard frames are primed 16 gage cold rolled steel.  Heavier lead applications (for 1/4" lead and greater) may require 14 or 12 gage steel. Please contact us should you have any further questions regarding the lead lining of our frames. Ray-Bar’s reputation of prompt national and global deliveries is attributed to it having possibly the largest inventory of shielding materials in the U.S.

Lead Lined Hollow Metal Doors Lead Lined Hollow Metal Door UL Fire Rated Lead Lined Hollow Metal Door 15 standard lead thicknesses Available up to 90 minute fire ratings Available with lead lined vision frames with x-ray safety glassgarage door repairs boulder Lead lined hollow metal welded door frames are available oonly with door purchasespeedy auto glass repair cost Ray-Bar Lead Lined Hollow Metal Doors are made from hot dipped galvanized steel in 18, 16 and 14 gauge steel conforming to ASTM A527, coating Classification ZF001. double glazed door weather stripThey are available non-rated, or with fire-ratings up to 90-minute.  home depot door jamb

They are UL listed for fire resistance and meet UL IOC and UBC 7-2-1997 positive pressure test requirements part I and II. Ray-Bar can also provide lead lined doors as stainless steel (304 with #4 finish), and bullet resistant (UL752) in Level 1 (medium power small arms), Level 2 (high power small arms), Level 3 (super power small arms), and certified Level 4 (high power rifle). For specifications, see Ray-Bar Lead Lined Hollow Metal Door Specifications. For listing of in-stock lead thicknesses available, see Ray-Bar Sheet Lead Thickness Chart or contact us for special designs or questions. Optional: Hollow Metal Lead Lined Welded Frames (Only offered if purchased with Ray-Bar Lead Lined Hollow Metal Doors)Hollow Metal Welded Frames are 16 gauge primered steel with anchors for metal studs,wood studs or concrete "cast in place" or retro-fit bolt-anchor (Hilti) into existing concrete or masonry walls.Equal rabbet or single step rabbet frame profiles can be formed to fit wall thicknesses from 5" up to 24"Heavier 14 gauge or 12 gauge hollow metal frames available for higher radiation lead shielding applications.

Continuous geared hinges help prevent doors from pulling away from their frames. School officials have a common complaint about doors: "We thought we got top-quality door hardware for our new building, but now the doors are beginning to sag after only six months." Medium- and high-traffic doors at schools and universities often show wear after only a few months because the frequent use and stresses are more than some traditional hinges can handle. Sagging doors occur most commonly when the top butt hinge or pivot has started to pull out from the frame. One way to prevent this condition is to begin with a full-length continuous geared hinge that distributes the door weight and stresses over the full length of the door and frame. Continuous geared hinges are used with aluminum, wood and hollow metal doors and frames. This product is being specified more and more for medium- to high-traffic interior and exterior school doors. Continuous geared hinges are well-suited for keeping entrance components in alignment while withstanding the pressure of many thousands of cycles per year and, in some cases, even thousands per day.

New school and university building entrances are usually designed with full-length continuous geared aluminum hinges. The continuous hinge can be anodized or painted to match nearly any exterior design. Constructed of three interlocking, anodized extrusions (two geared leaves and a cover channel), a continuous geared hinge installs on the full length of a door and frame, and uniformly distributes the opening and closing force of the door. The vertical door loads are carried on a series of either plastic or steel bearings along the full length of the hinge. Continuous geared hinges can be manufactured in light-duty, standard-duty, heavy-duty or extra-heavy-duty versions. The heavy-duty and extra-heavy-duty models have additional bearings and fasteners to support added door weight, extra-wide doors, lead-lined doors, or any doorway having unusually high traffic. The full-length design seals the gap between door and frame, offering security, privacy, noise reduction and weatherproofing. The dispersal of opening force along the length of the door also greatly reduces the amount of stress on a door caused by misaligned butt hinges or pivots, which by their nature localize door weight and stress at the upper portion of the door.

Most important, continuous geared hinges serve to reduce or eliminate door sag. Continuous geared hinges are installed on the surface of the door and frame. Because of the rapidly growing usage of continuous geared hinges, most door manufacturers now prepare their doors for continuous hinges. This eliminates the additional expense of a "custom" undersized door. Also, because a continuous geared hinge is designed to support the door along its entire length, the need to reinforce the frame is reduced. When the door is closed, most profiles have no exposed screws, bolts, pins or knuckles to be vandalized. All of these points are important factors for school building owners and architects to consider when deciding what kinds of doors to install. Here are descriptions of the three main applications for continuous geared hinges. Instead of being "mortised," the concealed type of continuous geared hinge is mounted on the hinge stile of the door and on the rabbet of the frame. This profile normally is specified for use in new school construction, but also can be used with new doors in existing frames.

A new square-edge door must be undersized by the amount of clearance needed at the lockside, plus 5/16-inch for the hinge (1/8-inch leaf + 1/8-inch leaf + 1/16-inch clearance between leaves = 5/16-inch). A new bevel-edge door must be undersized by the amount of clearance needed at the lockside, plus 11/32-inch for the hinge (1/8-inch leaf + 1/8-inch leaf + 3/32-inch clearance between leaves = 11/32-inch). The hinge cap on the profile requires a 7/16 -inch rotational clearance at the jamb side. The hinge opens to a full 180 degrees and is usually designed for either 13/4-inch or two-inch doors. The concealed hinge is engineered to work with a closer having a butt-hinge-type pivot point. Existing concealed floor or concealed overhead closers having a fixed center pivot point must be replaced with a traditional overhead surface closer. Concealed continuous geared hinges are normally installed with either 10-24 or 12-24 undercut head, self-tapping fasteners. A pilot hole needs to be drilled, and the fastener then forms its own threads.

Some installers use self-drilling fasteners, but they are not recommended for installation in mortar- or grout-filled door frames. The drill point in all probability will hit the mortar and create a "jacking effect" on the frame. It is recommended to first remove the mortar with a masonry bit. If possible with contract work, some form of mortar guard should be specified behind slushed-in frames. Security fasteners, wood screws and other fasteners also are available. - Full surface mounting. Full surface continuous geared hinges are installed on the face of a door and frame. This profile usually is used in retrofit situations, but also can be used with new doors and frames. The hinge is installed with 12-24 fasteners in the frame leaf, and fastened with sexnuts and 1/4-20 shoulder screws through the door. Full surface hinges also usually are designed with four locator holes per hinge to aid in the adjustment of the door to fit plumb and square in the entrance opening before installation of the door and frame fasteners.

This profile can be used on aluminum, wood and hollow metal doors up to 21/4-inch thick. A common use for full-surface hinges is on school building doors that have sagged due to damage or wear on the original butt hinge or pivot. Half-surface continuous geared hinges are installed on the face of a door, with the frame leaf concealed. The new door must be undersized by the clearance needed at the lock side of the door, plus 3/16-inch (1/8-inch frame leaf + 1/16-inch clearance = 3/16-inch) on the hinge side. The frame leaf is installed on the rabbet of the frame with 12-24 fasteners, and the door leaf is through-bolted to the door surface with sexnuts and 1/4-20 shoulder screws. This profile can be used on aluminum, wood and hollow metal doors up to 21/4 inches thick. A common use for half-surface hinges is on school building doors that have been weakened at the hinge edge, but the door itself is still serviceable. Continuous geared hinges are available with fire ratings ranging from 20 minutes to 3 hours.

Some concealed, full- and half-surface hinges need pins or studs to be fire-rated. Most manufacturers have gained approvals for positive pressure fire ratings. Continuous geared hinges have improved since they were introduced more than 25 years ago. Modern continuous geared hinges have templated hole patterns, lubricated bearings, permanent lubricants on the geared areas (which nearly eliminate maintenance needs), extended wear life, non-handed design, stainless-steel fasteners, security features, electrical modifications and decorative hinge caps. The Builders Hardware Manufacturers Association (BHMA) is working on establishing a cycle test standard for continuous geared hinges. Continuous geared hinges are manufactured in standard industry lengths (79, 83, 85, 95 and 119 inches) that allow for threshold clearance in most openings. Mounted flush with the top of the door and allowing 1/8-inch header clearance, standard length hinges allow 7/8-inch clearances at the bottom. Hinges can be cut to exact lengths on site, or at the factory.