Drywall Throat Fillers are used when wall thickness is between 1/8” (3mm) to 1/4” (6mm) less than the frame throat dimension, throat filler section(s) can be used to fill the gap, assuring the proper amount of grip required to complete the installation.
Drywall Throat Fillers are vinyl The Steelcraft Throat Filler is made of extruded rigid vinyl with double faced tape applied to the inside lip for installation on DW-Series frame backbends.
For further information, refer to Tech Data sheet 77titled "RIGID VINYL THROAT FILLER" in “Section 2:
Frames, variations & options, and anchoring systems” of the Tech Data
Manual which can be found here.
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