Deltana CDG35 Door Guard, Chain/Doorbolt

The CDG35 is a combination chain and doorbolt guard for entry doors. It lets the door open partway while staying restrained, so an occupant can see and speak to whoever is outside before releasing it and opening fully. It mounts on the interior face of the door and the frame, and it is a secondary security device, not a latch or lock, so the door still needs its own lockset. Solid brass construction.

Deltana classes the CDG35 as commercial. Solid brass throughout rather than a plated pot-metal chain guard, which is why it holds up in multi-family and hospitality corridors where the guard gets worked several times a day. Property managers standardizing apartment or guest-room entry doors can spec the same model across the building and vary only the finish.

Nine finishes: Polished Brass, PVD Polished Brass, Antique Brass, Oil Rubbed Bronze, Brushed Nickel, Antique Nickel, Polished Chrome, Brushed Chrome, and Paint Black. If you are matching a guard to existing knobs, hinges, or a deadbolt on the same door, the PVD Polished Brass is the one to pick for exterior-exposed or high-humidity openings, since PVD is a deposited coating rather than a lacquer and does not need the upkeep a plain lacquered brass finish does.

A chain-style guard like the Deltana CDG35 restrains the door on a flexible chain, so it takes up less door face and suits doors where the trim or the peephole crowds the mounting area. A swing bar guard uses a rigid arm and generally resists forcing better, but it needs a flat run of door and frame to mount the bar and its knob. For institutional or multi-family openings where you want the same look across every finish in the building, the CDG35 is offered in nine finishes, which is usually what decides it once the security function is equivalent.

The CDG35 body is solid brass, which does not rust the way a plated steel guard does when the corridor is open to weather. On coastal or exposed openings, go with a PVD finish, which resists tarnish far longer than a lacquered brass. Note that the guard mounts on the interior face of the door, so the exposure it actually sees is whatever the corridor sees, not direct weather.