Product Type Venting For Gas Heaters, Compatible with Product Type Wall Furnaces, Compatible Grainger Part Number 36FK10, 36FK11, 36FK12, 36FK13, 36FK14, 36FK15, 36FK16, 36FK17, 36FK18, 36FK19, 36FK20, 36FK21, 36FK22, 36FK23, 36FK24, 36FK25, 42ET74, 42ET75, Compatible Mfr. Model Number 3508231, 3508232, 3508631, 3508632, 4007331, 4007332, 4007731, 4007732, 5008631, 5008632, 5507331, 5507332, 6007731, 6007732, 6508631, 6508632, Opening Height 9 in, Opening Width 9 in, Opening Depth 9 in
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