Deltana DKMV4 Modern Door Knocker, UL Listed Viewer, Solid Brass

Deltana publishes one door thickness for the DKMV4, 1-3/8 inches, and it is given as a single figure rather than a range. Most exterior entry slabs are 1-3/4 inches, so measure the door at the edge before you commit. On a 1-3/8 inch door you are in spec, and the knocker arrives with its matching UL Listed viewer as one item.

The viewer ships with it. The DKMV4 is a combination piece, a modern-profile solid brass knocker packaged with a matching UL Listed viewer, sold by the each. One line per opening covers both halves; there is no separate viewer to add to the order.

The viewer is the UL Listed component of the DKMV4 assembly. Deltana states the listing against the viewer specifically, and it is carried in the product's certification record. The knocker body itself is solid brass.

The nearest match in the same size class is the Delaney 4 inch Door Knocker with 160 Degree Viewer, part number DLY-400x10. Both are single units that combine a knocker with a door viewer, so one bore serves both functions and the entry face carries one piece of hardware instead of two. The Deltana DKMV4 measures 4-5/8, is solid brass, carries a UL Listed viewer, and comes in Oil Rubbed Bronze, Brushed Nickel, Paint Black, Polished Chrome, and Brushed Chrome. The Delaney DLY-400x10 is specified as a 4 inch knocker with a 160 degree viewer. If you are matching an existing entry set or standardizing finishes across a building of front doors, the finish range is where the two differ most in practice.

Oil Rubbed Bronze is one of five finishes on the DKMV4. The others are Brushed Nickel, Polished Chrome, Brushed Chrome, and Paint Black. The viewer is finished to match the knocker, so both halves land on the same finish, which is the practical reason to buy the combination instead of pairing a knocker with whatever viewer is on the truck. Black is a painted finish rather than a plated one.

Brass in both the material and the substrate on the DKMV4, so the metal under the finish is the same as the body, not a plated zinc casting with a brass-colored coat. On an entry door that takes weather and daily hand traffic, that is the difference between a finish that wears and a casting that pits through.

A combination unit like the Deltana DKMV4 gets you one finish across both pieces and one item per door, which is what you want when you are doing a run of units and every front door has to look the same. Buy them separately when the viewer needs to sit at a different height than the knocker, when residents of varying height need the peephole placed to suit, or when the door is already bored for a viewer and all you need is the knocker.

The DKMV4 is a 4-5/8 inch knocker. If you want more scale on the door, Delaney Hardware's 6 inch door knocker with viewer is the larger option, and Delaney's 4 inch version sits just under the Deltana. Delaney publishes a 160 degree field of view on both of theirs, so those are the ones to look at if viewing angle is the deciding factor. The Deltana is the one specified in solid brass with a UL Listed viewer.

Step up to the Delaney 6 inch Door Knocker with 160 Degree Viewer, part number DLY-4001. It is the larger of the two Delaney knocker and viewer combinations, where the DLY-400x10 is the 4 inch version. The Deltana DKMV4 measures 4-5/8, so the Delaney 6 inch unit gives you a noticeably taller plate on the door face, which reads better on a wide stile or a tall commercial-scale entry door. Note that the larger plate is not a drop-in cover for a smaller one on an existing prep in the other direction: if you go from the 6 inch back down to the DKMV4, the smaller plate covers less of the door face.

The Deltana DKMV4 carries a UL Listed viewer, which is the certification called out on the product itself. That matters when a fire-rated entry door assembly is involved, because anything bored through a rated door is subject to what the listing on that door permits, and a listed viewer is what an inspector or a fire door assembly inspection will look for. The Delaney alternatives, the 4 inch DLY-400x10 and the 6 inch DLY-4001, are specified by viewing angle at 160 degrees. If the spec you are working to calls out a listed viewer, the DKMV4 is the one that answers it directly.

4-5/8 inches is the dimension Deltana gives for the DKMV4. Lay it out against the rail or stile you actually have, because on a door with a glass lite or a narrow center panel that number decides whether it centers cleanly or crowds the glass. On a flush slab there is room to spare.

Both Delaney knocker and viewer units publish a 160 degree viewing angle: the DLY-400x10 in the 4 inch size and the DLY-4001 in the 6 inch size. If a stated wide viewing angle is what the tenant is asking for, those two answer it by number and differ from each other only in plate size. The Deltana DKMV4 is the solid brass option in the group and is the one whose viewer is UL Listed, so the choice usually comes down to whether the requirement is a published viewing angle or a listed viewer, and then to which plate size and finish suits the door.