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Key Features

Choose from two configurations to meet your mailroom needs. The FPi 4520 comes with two feeder stations, including an upper station configured as a high-capacity unit for processing larger volumes of mail. For greater flexibility, choose the three-station FPi 4530. Both models include high capacity feeder stations and user-friendly color touch screens.




    • Automatically feeds, folds, inserts and seals.
    • Choose from two configurations for the appropriate document station capacity.
    • Processes up to 3,600 letters per hour.
    • Holds 325-725 sheets per feeder.
    • Color touch screen for simple, intuitive programming and control.
    • Fill & Start technology automatically measures documents and creates job settings.
    • Allows 25 programmable jobs for setting common insertion tasks with the touch of a button.
    • Load documents up to five pages thick.
    • Optical Mark Recognition (OMR) reads coded marks on documents to automatically collate and sequence pages.
    • Proprietary sheet control uses sensitive optical measurements to automatically detect double feeds.


    Speed Up to 3,600 inserts per hour
    Envelope width 5.5“ (min.), 9.8“ (max)
    Envelope length 3.5“ (min.), 6.4“ (max)
    Envelope quality 20lb. bond (min.), 30lb. bond (max.)
    Document width 5“ (min.), 9“ (max.)
    Document height 3.5“ (min.), 6.4“ (max.)
    Document quality 16lb. (min.), 62.5“ bond (max.)
    Insert dimensions At least 1/2“ less than envelope width
    At least 1/4“ less than envelope height
    Fold formats 1/2-fold (single-fold), C-fold (tri-fold), Z-fold, double parallel, no fold
    Thickness 1 to 8 sheets (20lb. bond ) tri-folded or up to 10 sheets folded in single fold (0.1 or 2.5mm thick depending on application)
    Weight 3 stations-165lbs.
    Physical dimensions 18″ (W) x 51“ (L) x 29″ (H)
    Power requirements voltage 115V AC frequency 60HZ
    Capacity – Feeder Stations
    Automatic station (25lb.) 325
    HC-Automatic station for increased capacity (25lb.) 725
    Special automatic station (25lb.) 325
    Maxi-feeder 325 BREs / 1,200, 8.5″ x 5.5″ supplemental
    Envelopes 325
    High-capacity envelope vertical stacker (HCVS) Up to 500 envelopes (single fold)

    How You Benefit

    Improve Productivity

    Improve Productivity

    Inefficient business processes drain productivity. DSI helps you automate your workflows, removing the roadblocks to productivity.
    Learn More

    Reduce Operating Expense

    Reduce Operating Expense

    Document production and management consumes one to three percent of an organization’s annual revenue. DSI helps you manage and reduce these expenses.
    Learn More

    Increase Bottom Lines

    Decrease Carbon Footprint

    Between paper and power usage, document production is one of the largest areas of environmental impact in your business. DSI helps you reduce your carbon footprint.
    Learn More