National Custom Hollow Metal

read moreYou never quite realize just how much noise that we manage to filter out as we go through our daily routine. Whether we're at work, in traffic, having dinner, or just trying to relax at home, we're constantly bombarded with noise, and don't realize it until those times when we really need to be able to concentrate in silence. Some people are pretty good at working through just about any racket that they encounter, but we can all agree that a quiet workplace is typically more productive.

read moreOur TrustShield Lead Lined doors are available in 16, 14 or 12 gauge galvanneal or 16, 14 or 12 gauge stainless steel construction with a continuous sheet of lead from 1/32″ thick up to 1/8″ thick, laminated to door skin and a sheet of high density polystyrene. The lead sheet extends the full width and height of the door. Lead thickness is to be equal to the shielding in the adjacent wall. Due to their weight and constructions, these doors require hardware specifically designed and manufactured for this application.

read moreEach door has a self-extinguishing polystyrene core between CR A-60 galvanneal steel facings. This creates a superior barrier to heat and cold. DP Series doors are available in 18, 16, 14 or 12 gauge with heavy-gauge perimeter channels. Each of our doors is well suited for institutional, industrial or residential use in 1-3/4″ and 1-3/8″ thickness. Customers may also order other optional hardware preps, including 5″ hinge, all types of exit devices, surface and concealed door closers, and overhead holders and pivots.

read moreNCHM is capable of making any door or frame you can imagine. We can make all the products pictured below, but we can build any other custom product you need. Whether it is a necessity for a unique appearance, such as hexagon lights in your door, or a need to accommodate special conditions of your job site, shown in the sliding plate door to allow pipes to run beneath the door, National has you covered. No matter how complex the custom product is, we promise to provide quality frames and doors on a fast shipping lead time.