Content Container Heavy gauge frame and blades and all welded construction make this series of grilles and registers extremely durable. These models are perfect for locations that require strong impact resistance. The blades are spaced on 1/2" (13) centers. Models 0° Fixed Blades 61FH-HD - Horizontal (Long) Front Blades 61FH-HD-O - Horizontal (Long) Front Blades • with Steel OBD 61FV-HD - Vertical (Short) Front Blades 61FV-HD-O - Vertical (Short) Front Blades • with Steel OBD 45° Fixed Blades 6145H-HD - Horizontal (Long) Front Blades 6145H-HD-O - Horizontal (Long) Front Blades • with Steel OBD 6145V-HD - Vertical (Short) Front Blades 6145V-HD-O - Vertical (Short) Front Blades • with Steel OBD Heavy Duty Filter Grille 61FB45-HD - Heavy Duty • Fixed 45° Deflection • ½" (13) Spacing 61FBS-HD - Heavy Duty • Fixed 0° Deflection • ½" (13) Spacing Submittals All Submittals Combined Individual Submittals 6145H-HD(-O), 6145V-HD(-O), 61FH-HD(-O), 61FV-HD(-O) • Fixed Bars 61FB45-HD, 61FBS-HD • Steel Heavy Duty Filter Return Grilles • Fixed Louver Blades • Gymnasium Options and Accessories Oversized Grille Construction • 6100-HD series Returns • Duct Sizes Larger than 48" Control Sequence Finish Finishes for Grilles, Registers & Diffusers Woodgrain Finish Brochure IOM 5100-HD, 6100-HD • Screw Hole Location Chart Specifications Louvered Return • 5100, 6100, 6700 • Word Document [.docx] Steel Heavy Duty Return • 61-HD • Word Document [.docx] Performance Data 6145H-HD, 6145V-HD • 45° Deflection • Steel 61FH-HD, 61FV-HD • 0° Deflection • Steel Catalog Literature