Zero International 322BK Perimeter Seal Set with Sponge Neoprene

The 322BK set covers one standard opening: one 36 inch piece for the head and two 80 inch pieces for the jambs. The extrusion is aluminum with a closed cell sponge neoprene insert and mounts with screws. It seals head and jambs only, so if you need the bottom of the door sealed you will be adding a door bottom or shoe separately.

Fire rated and UL10c listed, and it also carries air seal and smoke seal ratings. That combination is what a labeled opening usually calls for when the door schedule asks for smoke and draft control gasketing.

The housing is 1.5 inches wide and .437 inches high. On a typical hollow metal frame that width sits on the stop face without fouling the door, but on narrow wood casings or frames with a shallow stop face, measure the flat before you order.

Yes. The NGP 155V is a vinyl perimeter seal in a mill aluminum frame intended for commercial door weatherstripping, and the Cal-Royal PG-601 is an aluminum channel perimeter gasketing with a vinyl insert. Both use a vinyl insert rather than the closed cell sponge neoprene insert used in the Zero 322BK, and both are supplied in a mill or plain aluminum channel rather than the black anodized finish the 322BK carries. The 322BK is the one to specify when you need the UL10c fire rating plus air seal and smoke seal ratings on the opening.

The NGP 108NA is a neoprene sponge seal mounted in an anodized aluminum frame, so it matches the Zero 322BK on both the closed cell sponge neoprene insert and the anodized aluminum housing. The NGP 108NA is rated for a temperature range of -20 F to 200 F. The Zero 322BK is supplied as a perimeter seal set with one 36 inch piece and two 80 inch pieces, 1.5 inches wide by .437 inches high, screw mounted, and carries UL10c fire rating along with air seal and smoke seal ratings. If you are buying by the piece rather than as a head-and-jamb set, confirm the piece lengths you need before substituting.

No, they are not interchangeable even though both mount around the door perimeter. The NGP 602A is a nylon brush seal in an anodized aluminum housing, and a brush sweeps debris and light drafts without forming a continuous compressed barrier. The Zero 322BK uses a closed cell sponge neoprene insert and is UL10c fire rated with air seal and smoke seal ratings, which is what a smoke or fire rated opening requires. Specify the 322BK where the drawing calls for a smoke or air seal; the brush seal suits dust control and high traffic openings that do not carry those ratings.

Individual pieces are stocked at 36, 72 and 84 inches, all in black anodized. The 36 inch is the head piece for a standard 3-0 opening; 84 inch covers a 7-0 jamb, and 72 inch suits shorter leaves or cut-down work. Aluminum cuts clean with a miter saw if you need an in-between length.

Closed cell sponge neoprene compresses against the door face and is the common choice for adjustable sound and draft control on a swinging door. Where you want the seal to pull itself tight rather than rely on compression, a magnetic type like the NGP 159MA in 84 inch anodized aluminum is the other approach. A brush seal such as the NGP 602A slides quietly but does not give you the same air and smoke performance.

Look at the NGP 159MA magnetic seal, which uses a magnetic sealing element in an anodized aluminum housing and is offered in an 84 inch length; it pulls closed against a steel frame or a steel strip on the stop rather than relying on compression. The Zero 322BK is a compression type adjustable sealing system using a closed cell sponge neoprene insert in an aluminum channel, screw mounted, and is likewise intended for sound control work. The magnetic seal requires a ferrous surface to seal against, so it is not a drop-in on an aluminum or wood frame where the 322BK would work.

It is a commercial product. The aluminum housing, screw mounting and the UL10c fire rating put it on corridor, stairwell and tenant entry doors in multi-family and office buildings rather than on interior residential doors. For a property manager standardizing a building, the black anodized finish repeats across every opening you order it for.

The 322BK is sold as a set of extrusions with the sponge neoprene insert already in them, in 36, 72 and 84 inch pieces. If the insert on an existing run is flattened or torn, the straightforward fix is to unscrew the old extrusion and screw in a new piece of the same length, which puts fresh aluminum and fresh neoprene on the frame at once.