Zero International 155AA Adjustable Surface Astragal with Brush

Yes. The 155AA adjustable surface astragal can be used with both doors active, so neither leaf has to be fixed as an inactive leaf. It surface mounts to the meeting stile and seals the gap between the two leaves with a polypropylene pile insert, so both doors stay operable while the joint stays sealed.

Yes, and it is meant to be cut. The 155AA ships at 84 inches, which matches a nominal 7 foot leaf, and on a shorter opening you trim the aluminum extrusion to the leaf height on site. Order one piece per pair, since it mounts on one leaf and seals against the other.

No. The 155AA seals only the vertical joint between the two leaves at the meeting stile. The head, the jambs, and the threshold gap all need their own parts, typically perimeter gasketing on the frame and a door bottom or sweep on each leaf. If you are chasing sound or air leakage on a pair, sealing the meeting stile alone leaves three sides open.

Adjustable means the astragal body sets the pile depth against the opposing leaf rather than being fixed at one projection. On a pair whose gap varies top to bottom, or that has racked over time, you tune the seal so the brush stays in contact along the full height instead of leaving a gap at one end. That contact is what makes these adjustable sealing systems useful for sound control.

A pile brush like the 155AA carries the seal with almost no closing resistance, which is why it suits pairs that both swing and doors that get heavy traffic. A solid bulb or neoprene meeting stile compresses harder and does more for smoke and air infiltration, but it drags on the leaf and can push a pair out of alignment. For sound control on an active pair, the adjustable pile is the one Zero points at.

Commercial. The 155AA is a commercial grade perimeter seal, an anodized aluminum extrusion with a replaceable-style pile insert rather than a light residential vinyl strip, which is why it holds up on an entry pair that cycles all day.

Surface applied. The 155AA fastens to the face of the meeting stile with no routing or mortising, which is what makes it a retrofit part: you can add it to an existing pair that was hung without an astragal, without pulling the doors or machining the stile.

Clear anodized only. That is the standard mill-look aluminum finish, so it reads the same as clear anodized storefront framing and aluminum entrance leaves. Against a dark bronze or painted hollow metal pair it will contrast, so plan for that on a visible meeting stile.