Model DDF-GB fittings incorporate an unframed DDF-G Series grille on a fitting body constructed from the appropriate SMACNA gauge material. The grille is sized to exactly fit the cutout required for the desired air volume. Model DDF-GB fittings are available in diameters ranging from 6 through 60 inches with 30° to 180° venting.

The Model DDF-GD fitting allows airflow modulation through the use of an internal barrel damper. Wing nuts mounted inside slots on either side of the grille provide accurate volume flow adjustments. The Model DDF-GD fitting incorporates unframed grilles only and is available in diameters ranging from 6 through 36 inches with 30° to 180° venting.

Model DDF-GB Fitting (unframed grille, no internal barrel damper, mounted on fitting body)

Model DDF-GD Fitting (unframed grille only, with internal barrel damper, mounted on fitting body, adjustable volume flow rate)

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An enterprise of United McGill Corporation—Family owned and operated since 1951

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