Vol 2 - Garney Construction

2. Panel Arrangement: Panels mechanically fastened together forming aself-framing housing with no additional structural support required ormechanically fastened to a fully welded unitized frame assembly.3. Outdoor Units:a. Weathertight and rated for outdoor use.b. Cross broken and sloped roofcap system.c. Drip shield/overhang provided on all four sides of unit.d. Caulked/sealed standing top seams to assure waterproofing.4. Material: Panels, fasteners and structural metal frame membersconstructed from G-90 galvanized steel.5. Outer Panels:a. Outdoor Units:1) Walls and Roof: Minimum 16-gauge (0.0625 in.) thicknesssheet metal.6. Inner Panels:a. Walls and Roof: Minimum 20-gauge (0.0348 in.) thickness sheetmetal.b. Floor Plate: Minimum 16-gauge (0.0625 in.) thickness sheetmetal.7. Joints:a. Joints between exterior panels and structural frames shall haveseals and gaskets with appropriate material type for air seal andacoustical break.b. Seams caulked and sealed for an airtight unit.c. Fully through-bolted section to section joints.8. Insulation:a. Single Wall Casing Units:1) Insulation secured with steel angles.2) Longitudinal insulation joints and butt ends covered by asheet metal break to prevent erosion of exposed edges.b. Double Wall Casing Units: Insulation fully encased betweenoutside and inside panels.c. Properties:1) 1-inch thickness, 3 pounds per cubic foot density.2) Units with Perforated Liner or Exposed Insulation: Blackcomposite protective coating on surface exposed toairstream.3) Maximum effective thermal conductivity (C) of 0.24 Btuinch per square foot degrees F.4) Minimum NRC of 0.70 per inch thickness.9. Access Doors:a. Heavy-gauge, 0.0625 inch minimum, oversized access doorsinsulated, double wall construction, internal sheet metal skin.AIR HANDLING UNITSPW/WBG/38205923 77 00 - 8 AUGUST 15, 2012©COPYRIGHT 2012 CH2M HILL