LSD

PART 1 – GENERAL

1.1 SUMMARY

A. High induction linear slot diffuser(s) with independently adjustable 4 in (100 mm) long sectors (curved blades) to form 1-way, 2-way, 2-way alternate (standard), vertical, or hybrid air patterns.

B. Diffusers shall be suitable for supply and return applications, 1 to 4 slots, as scheduled.

C. Standard factory configuration: 2-way alternate pattern for higher induction and stable air stream.

D. Performance envelope: stable air stream with approximately 60% airflow variation; suitable for ceiling heights 8.5 to 13 ft (2.6 to 4.0 m) and temperature differential up to 22°F (12°C), unless otherwise indicated.

E. Continuous installations: Provide multiple sections joined to form continuous lines with active/inactive areas as scheduled; provide 90-degree corner sections where indicated.

1.2 SUBMITTALS

A. Product Data: Manufacturer’s data for scheduled number of slots, length, air pattern(s), and mounting type, including pressure loss, diffuser-generated NC, throw data (as published), and induction ratio.

B. Shop Drawings: Show diffuser type (supply/return), number of slots, length(s), end borders (if any), finish, vane color, mounting method, plenum type and duct connection (if plenum is provided), damper/equalizer option selection, acoustical liner/thermal insulation options (if provided), and continuous/joint layout including corner sections.

C. Airflow Prediction Report (Required): Manufacturer-generated room airflow prediction report for each diffuser type and unique room condition using manufacturer performance data and recognized correction methods. Report shall include:

1. 3D room layout with diffuser placement
2. Airflow visualization views: plan, section, elevation
3. Throws for terminal velocities of 150, 100, 60, 50, 40, 30, and 20 fpm
4. Pressure loss at scheduled airflow
5. Diffuser-generated NC
6. Perceived NC at room center (5 ft height), 63–8000 Hz octave bands; include assumptions used

D. Verified CFD Validation (When Indicated): Provide EffectiV Verified CFD validation and summary report for spaces indicated and/or when operation is outside published selection limits.

1.3 SUBSTITUTIONS

A. Substitutions per Division 01. Proposed equals shall provide a line-by-line compliance matrix including all Part 1 deliverables, including the Airflow Prediction Report.

PART 2 – PRODUCTS

2.1 BASIS OF DESIGN

A. EffectiV LSD high induction linear slot diffuser(s) with independently adjustable curved blades and sector-based control.

2.2 MATERIALS AND CONSTRUCTION

A. Diffuser body: Extruded aluminum.

B. Adjustable blades: Curved PVC sector blades; each sector independently adjustable.

C. Vane color: White or black, as scheduled.

2.3 SIZES AND CONFIGURATION (AS SCHEDULED)

A. Number of slots: 1, 2, 3, or 4.

B. Length: Provide lengths as scheduled; provide sections with end borders or interior (no end borders) as required for continuous layouts. Provide 90-degree corners where scheduled.

C. Factory air pattern: Provide 2-way alternate as standard unless otherwise scheduled.

2.4 FINISH

A. Factory finish: Powder coat, TGIC-free, White M9016 unless otherwise scheduled; alternate finishes where specified.

2.5 MOUNTING (AS SCHEDULED)

A. PL: Concealed spring clips mounting (requires PLSD plenum) for quick installation and removable access.

B. PM: Concealed U-clip / long screw mounting kit for installation without plenum into drywall.

C. T: Visible screw mounting, where scheduled.

2.6 PLENUMS, DAMPERS, AND OPTIONS (AS SCHEDULED)

A. Plenums (as scheduled): High performance plenum box type:

1. PLSD: Side connection
2. PLSD-T: Top connection

B. Air equalizing grid (option): Provide where scheduled.

C. Integrated air volume damper / equalizer options (as scheduled):

1. Perforated damper + air equalizer
2. R
3. MRT: Manual cable through face
4. MRT2: Manual cable through drywall with termination fixture
5. EB: Battery-operated electro-balance damper, remote control, cable through face
6. EB2: Battery-operated electro-balance damper, remote control, cable through drywall with termination fixture

D. Plenum insulation (options, as scheduled):

1. 1/2 in acoustical liner
2. 1 in acoustical liner
3. 1/2 in closed-cell acoustical liner
4. 2 in R6 thermal insulation

PART 3 – EXECUTION

3.1 INSTALLATION

A. Install straight, level, and aligned; coordinate continuous sections, inactive segments, and corner sections as scheduled.

B. Where PL mounting is scheduled, install diffuser to PLSD/PLSD-T plenum using concealed clip system and provide access for removal/re-installation.

3.2 ADJUSTING

A. Balance to scheduled airflow.

B. Adjust sectors to achieve scheduled air pattern (1-way, 2-way, 2-way alternate, vertical, or hybrid) and verify resulting comfort intent.