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  1. 4 in. x 12 in. x 20 ft. Prime #1 Fir Lumber - The Home Depot

  2. 4 x 12 x 20' #1 & Better S4S Douglas Fir Timber at Menards®

  3. 4 x 12 x 20 #2 Green Douglas-Fir S4S Lumber - Lowe's

  4. 4-in x 12-in x 20-ft Cedar Rough Green Lumber - Lowe's

  5. 4 in. x 12 in. x 20 ft. #2 Premium Grade Fir Dimensional Lumber

  6. 4X12X20 PT DF #2 & BTR Brown Tone, Ground Contact, Doug Fir, …

  7. 4 x 12, Douglas Fir, No. 2 & Better, Green, Surfaced on 4 Sides

  8. Span Tables - Calculate Joist, Rafter and Wood Beam Spans

  9. 4 x 12 Dimensions | Beam Dimensions

  10. Heavy Timber Beams - Twin Creeks Log Home Supply