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  • Units are constructed of durable 16-gauge galvanized steel
  • “Z” channel support members reinforce all four corners
  • All tracks and doors are fully gasketed
  • Holding frames or fasteners are not required

SureSeal side access filter housings are two-stage units designed to accommodate ASHRAE rated filters that are 6″ to 36″ in depth. They are factory assembled flanged units suitable for installation in a duct or attached to an air handling unit. As little as 22″ of in-line depth is required, with no need for holding frames or fasteners.

SureSeal housings accommodate prefilters and primary filters of different types and efficiencies. Filters are easily serviced through quick-opening access doors. Factory-gasketed filters, channels, and doors ensure positive sealing. The efficiency of fully-loaded housings is equal to that of the individual filters. The recommended system static pressure range for standard housings is -4.0 in. w.g. to +3.0 in. w.g. The leakage rate is less than 0.5% of airflow at 6.0″ w.g. internal static pressure.


SureSeal housings include 2″ prefilter tracks for AAF Flanders’ pleated or fiberglass filters. Sureseal units are available in sizes up to 8 feet high x 12 feet wide. If large units are not practical to install, smaller units are available with modifications to facilitate stacking.


  • Double-walled insulation on doors only or on entire housing
  • Flanges to connect with air handlers
  • 4″ thick prefilter track
  • Aluminum or 304 stainless steel construction

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