2930 MAPLE ST KAISER PERMANENTE 2025-05-12

KAISER PERMANENTE Site Prep #1 Electrical Service ASC & Clinic (HUB) March 18, 2020 Everett, WA Project No. 19.05002.00 D. Elbow Configuration: Round Duct: Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Figure 3-3, "Round Duct Elbows." a. Round Elbows, 8 Inches and Smaller: Fabricate stamped elbows for 45- and 90-degree elbows and pleated elbows for 30-, and 60-degree elbows. Stamped elbows shall be 20 gauge thick minimum with two- piece welded construction. Fabricate nonstandard bend -angle configuration or nonstandard diameter elbows with mitered construction. b. Round Elbows, 9 through 12 Inches: Fabricate segmented (mitered) or pleated elbows for 30, 45, 60, and 90 degrees. Fabricate nonstandard bend -angle configuration or nonstandard diameter elbows with mitered construction. C. Round Elbows, Larger than 12-Inches: Segmented (mitered) elbows for all bend angle configurations. d. Round Elbows, Segmented (mitered) Two -Piece 90-Degree: Use only where specifically indicated. Fabricate with single turning vane. e. Flat Oval Elbows: Segmented (mitered) type. E. Branch Configuration: Round and Flat Oval: Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Figure 3-4, "90 Degree Tees and Laterals," and Figure 3-5, "Conical Tees." Saddle taps are not permitted. 90-degree Tee Fittings: 1) Main to Branch (branch greater than 2/3 the diameter of main or 12-inch diameter branch): Use 90 degree conical tee fitting. 90- degree conical taps or 90-degree lateral fittings can be used for all others. 2) 45 degree lateral tee and 45-degree elbow in lieu of 90-degree tee fitting or tap on supply ductwork where space allows. 45-degree Tee Fittings: 1) Main to Branch (branch greater than 2/3 the diameter of main or 12-inch diameter branch): Use 45-degree lateral fitting. 45- degree lateral taps or 45-degree lateral can be used for all others. 2.7 ROUND AND FLAT -OVAL EXHAUST FITTING FABRICATION A. 90-Degree Tee Fittings and Taps: Fabricate to comply with SMACNA "HVAC Duct Construction Standards --Metal and Flexible," with metal thicknesses specified for longitudinal seam straight duct. B. Diverging -Flow Fittings: Fabricate with a reduced entrance to branch taps with no excess material projecting from body onto branch tap entrance. C. Round Elbow Construction: Fabricate in die -stamped, pleated, or mitered construction as indicated above. Fabricate bend radius of elbows to one and one-half times elbow diameter. Unless elbow construction type is indicated otherwise, fabricate elbows as follows: METAL DUCTS 2331 13 - 6