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four panel sliding door that is open in the middle

    Sliding Patio Door Assemblies & Accessories

    From knock-down frame assemblies to mullions and trim, explore installation assemblies and accessories designed to help make life easier.

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    Mullion Installation Instructions

    Pella® Impervia®

    Select a mullion assembly/combination instruction from the list below.

    Instructions

    description Standard Joining Mullion for Sliding Patio Door

    description Windows

    Structural Mullion for Sliding Patio Door

    Helpful Resources