LINEAR DIFFUSERS AND BAR GRILLES
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- Crystal Thornton
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1 LL LL2 Linear ar Grilles The Nailor 4900 Series provides an extruded aluminum bar grille that offers beautiful styling and efficient performance. Linear bar grilles offer a choice of fixed air patterns with 0, 15 or 30 air deflection, a choice of bar widths and spacing and a wide choice of border/frame style combinations to suit most types of installation. They are available with an optional opposed blade damper for volume control. Linear bar grilles are recommended for supply air applications in floors, window sills, and high sidewall locations. They are not generally suited to ceiling mounted supply applications (other than for directional spot heating or cooling as an air curtain) as they are not designed for horizontal projection from the face. s , , , See page , , , Suffix '-O' adds a steel OD Linear Louver Diffusers The Nailor 48LL Series Linear Louver (Vane) Diffusers are designed to provide a high capacity, architecturally pleasing linear diffuser that can supply large volumes of air at relatively low sound levels and pressure drops. High quality, extruded aluminum angular discharge louvers are designed to create a stable horizontal air pattern that is tight to the ceiling. Ideal for applications in VAV systems, these diffusers create a strong ceiling coanda effect at typical maximum and minimum flow rates and ensure optimal comfort conditions. s 48LL1, 48LL2 See page 49 Suffix '-O' adds a steel OD Suffix '-OA' adds an aluminum OD 4
2 LINEAR LOUVER DIFFUSERS EXTRUDED ALUMINUM ARCHITECTURAL HIGH CAPACITY SQUARE OR RECTANGULAR NECKS s: 48LL1 One-way Pattern 48LL2 Two-way Pattern Suffix '-O' adds a steel OD Suffix '-OA' adds an aluminum OD s 48LL1 and 48LL2 The Nailor 48LL Series Linear Louver (Vane) Diffusers feature architectural linear styling for high capacity supply and return air applications in hard ceilings or sidewalls. They are designed for duct mounted installation. Standard finish is a high quality, baked enamel for long life and easy cleaning. Designed for use in discrete lengths, the fixed louvers provide a tight horizontal discharge pattern over a wide range of airflow rates and are an excellent choice for VAV systems. FEATURES: Spring loaded core. Removable without the use of tools. Secure core attachment. Installation is with concealed screws through the neck of the outer frame, providing an aesthetically clean visual appearance (Type N). Options: Steel opposed blade damper (factory mounted) 48LL1-O or 48LL2-O. Aluminum opposed blade damper (factory mounted) 48LL1-OA or 48LL2-OA. DV Directional vanes. Type A screw fastening (face). Material: Aluminum extrusions. Finish: AW Appliance White baked enamel finish is standard. Other finishes are available. 4 1/4" (108) 2 1/2" (38) W + 4 3/4" (121) CEILING OPENING = L + 3" (76) NOMINAL DUCT SIZE L L 1/4" (6) OPTIONAL OPPOSED LADE DAMPER L + 4 3/4" (121) OPTIONAL REAR DIRECTIONAL VANES 1/4" (6) 49
3 Dimensional Data Linear Louver Diffusers AVAILALE SIZES: Unit Size is determined by duct width W. Diffuser necks are undersized. 48LL1: Available widths are 3", 4 1/2", 6", 7 1/2", 9", 10 1/2", 12" (76, 114, 152, 191, 229, 267, 305). Standard lengths are 24", 36", 48", 60" and 72" (600, 900, 1200, 1500 and 1800). 48LL1 One-way pattern NOMINAL DUCT SIZE W W 1/4" (6) W + 4 3/4" (121) 48LL2: Available widths are 3", 6", 9", 12" (76, 152, 229, 305). Standard lengths are 24", 36", 48", 60" and 72" (600, 900, 1200, 1500 and 1800). Available Widths Nominal Duct inches 3 4 1/ / /2 12 Width mm W 48LL2 Two-way pattern NOMINAL DUCT SIZE W W 1/4" (6) W + 4 3/4" (121) Available Widths Nominal Duct inches Width mm W 50
4 HOW TO SPECIFY OR TO ORDER (Show complete Number and Size, unless "Default" is desired). Extruded Aluminum Linear Louver (Vane) Diffusers Series 48LL 48LL2 - O - 48" x 6" - AW - N - MM - MODEL - One-Way Pattern 48LL1 - Two-Way Pattern 48LL2 DAMPER - No Damper (default) - Steel Damper O - Aluminum Damper OA LENGTH (inches) WIDTH 48LL1 (inches) - 3", 4 1/2", 6", 7 1/2", 9", 10 1/2", 12" (mm) - 76, 114, 152, 191, 229, 267, LL2 (inches) - 3", 6", 9", 12" (mm) - 76, 152, 229, 305 Notes: 1. Currently only available in discrete lengths of up to 72" (1829). 2. Contact factory regarding availability of continuous lengths. 3. Consult Dimensional Data page for available length dimensions. ACCESSORIES - None (default) - Directional Vanes DV END CAP CONFIGURATION - Mitered Mitered (default) MM - Open Open OO - Mitered Open MO (for 48LL2) - Mitered Open MU (for 48LL1) or - Mitered Open MD (for 48LL1) or FASTENING - None (default) N - Screw Holes A FINISH - Appliance White (default) AW - Aluminum AL - Mill Finish MI - Special SP SUGGESTED SPECIFICATION: Furnish and install Nailor (select one) 48LL1 (one-way pattern) or 48LL2 (two-way pattern) Linear Louver (Vane) Diffusers of the sizes and capacities as shown on the plans and air distribution schedules. The diffuser shall be manufactured from extruded aluminum and incorporate fixed pattern discharge louvers for a horizontal throw pattern. The entire core assembly shall be removable without the use of tools. The length shall be available in standard nominal lengths of 24", 36", 48", 60" and 72" (600, 900, 1200, 1500 and 1800 mm). The rectangular duct connection collar shall be an integral part of the frame assembly and be not less that 1 1/2" (38) high. The finish is to be AW Appliance White baked enamel (optional finishes are available). (Optional) An opposed blade damper, constructed of heavy gauge corrosion-resistant steel (aluminum is optional) and operable from the face of the diffuser, shall be provided on all units. The manufacturer shall provide published performance data for the linear louver diffuser, which shall be tested in accordance with ANSI/ASHRAE Standard
5 Performance Data : 48LL-1 One-Way Pattern Nominal Neck Velocity Duct Width, Velocity Pressure inches Total Pressure CFM per ft " NC Throw CFM per ft /2" NC Throw CFM per ft " NC Throw CFM per ft /2" NC Throw CFM per ft " NC Throw CFM per ft /2" NC Throw CFM per ft " NC Throw LL-2 Two-Way Pattern Nominal Neck Velocity Duct Width, Velocity Pressure inches Total Pressure , CFM per ft " NC Throw CFM per ft " NC Throw CFM per ft " NC Throw CFM per ft " NC Throw Throw Correction Factors for Various Lengths Length (ft.) Throw Correction NC Correction Factors for Various Lengths Length (ft.) NC Correction Performance Notes: 1. All pressures are in inches w.g. 2. Horizontal throws are given at 150, 100 and 50 fpm terminal velocities under isothermal conditions. 3. Throw values are based on a 4 ft. section. For other lengths, use the correction factor table above. 4. NC values are based on a 4 ft. section and a room absorption of 10 d, re watts. For other lengths, use the correction factor table. Dash ( ) in space denotes an NC value less than When used as a return intake, the NC value is increased by 4 and the negative static pressure is TP x Data derived from tests conducted in accordance with ANSI/ASHRAE Standard
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