GUIDE SPECIFICATION FOR

LAMI-AIRTM IP LAMINAR FLOW INTEGRATED diffuser PlenumS with lami-ventTMdiffusers

Section 23 37 13

DIFFUSERS/REGISTERS/GRILLES/AIR CONTROL DEVICES

NOTE TO SPECIFIERS: READ & FOLLOW INSTRUCTIONS IN ALL RED CAPS AND DELETE DIRECTIVES AND OPTIONS NOT SELECTED. ($) indicates an added cost for OPTION/FEATURE.

PART 2 - PRODUCTS

2.01INTEGRATED LAMINAR FLOW DIFFUSER PLENUM

  1. IP - Integrated diffuser plenum shall be the dual chamber, non-aspirating, unidirectional laminar flow type. Diffuser shall utilize a two chamber plenum design to deliver air to the space with zero aspiration at the face of the perforated plate. Integrated diffuser plenums shall utilize two separate chambers, upper chamber to delivering air from the supply duct tomultiple laminar diffusers and lower chamber to deliver air downward into the space through laminar diffuser. Air delivered to the space shall be uniform in direction and speed without aspiration at the face of the perforated plate. Air shall be admitted to each plenum through a rectangular inlet collar sized by manufacturer in accordance with each plenum’s air volume requirement. Plenum shall be constructed of 0.063” aluminum with P-4000 Unistrut channels welded to the top of plenum for suspension of the plenum assembly from above. Any hardware for installation and suspension of plenum shall be supplied by installing contractor.
  1. A solid, .040” aluminum plate with two rectangular cutouts located directly above a V-shaped diffusion basket shall separate the diffuser’s upper and lower chamber. Manufacturer shall supply each diffuser with an internal balancing mechanism which shall be adjustable by turning a screw from the room side of the diffuser. The diffuser’s lower chamber shall have a V-shaped, perforated diffusion basket mounted within a rectangular, perforated diffusion basket to evenly distribute air over the entire face of the diffuser. Multiple perforated plates in lieu of a diffusion basket will not be allowed. The diffuser frame shall be constructed of a .063" aluminum extrusion with mitered, back-welded corners. No cracks or gaps in the sides of diffuser frame will be allowed. Single chamber designs or designs utilizing flat or perforated plates to equalize flow are not acceptable.
  1. Perforated distribution plate shall be 0.050" aluminum. Perforations to be 16% open area designed for air volume of 40 or less CFM per square ft. of diffuser area. Plate shall be retained to the diffuser frame through use of captive, quarter-turn fasteners. Manufacturer shall provide vinyl-coated stainless steel cable safety retainers on two opposite sides to prevent accidental dropping of faceplate. The diffuser perforated faceplate shall be installed in an extruded aluminum mounting frame with mitered back-welded corners. No diffusion component may be affixed to the back side of the faceplate frame. The back side of faceplate shall be easily accessible for ease of cleaning.
  1. All exposed surfaces including border trim shall have finish of white baked enamel of suitable quality to withstand typical cleaning solutions and normal scrubbing commonly used in hospital operating rooms.
  1. Acceptable model and manufacturer: Lami-AirTMIP by Precision Air Products Company, (800) 404-0931. No substitutes. Manufacturer must have at least 5 years experience successfully producing systems as specified herein.

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PLENUM AND DIFFUSER OPTIONS:

To specify REMOVABLE PLUG BUTTON ON DIFFUSER’S FACEPLATE ($), add the following to section 2.01, paragraph C.:

Manufacturer shall provide removable plug button in center of diffuser’s faceplate to gain access to volume adjustment valve without removal of faceplate. Plug button to match color of diffuser finish.

To specify factory-applied exterior insulation TO EACH INTEGRATED DIFFUSER PLENUM ($), add the following to section 2.01, paragraph A.:

Manufacturer shall insulate exterior of each integrated plenum with 1-1/2" duct wrap FSK-backed insulation of 0.75lb/c. ft. density to prevent condensation of moisture and heat gain.

To specify a stainless steel faceplate ($$) in lieu of aluminum, replace section 2.01, paragraph C. with one of the following:

For optional ($$) wrap-around style stainless steel faceplate:

  1. Perforated distribution plate shall be 20 Ga. 304 stainless steel with No. 4 polished finish. Plate shall extend over and wrap around plate frame on all four sides to assure continuous perforated surface appearance between ceiling tee frames. Perforations to be 16% open area for 40 or less CFM per square ft. of module, 23% open area for 45-65 CFM per square ft. of module, or 33% open area for higher velocities. Plate shall be retained to the diffuser frame through use of captive, quarter-turn fasteners. Manufacturer shall provide vinyl-coated stainless steel cable safety retainers on two opposite sides to prevent accidental dropping of faceplate. No diffusion component may be affixed to the back side of the faceplate frame. The back side of faceplate shall be easily accessible for ease of cleaning.

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2.02BLANK-OFF PANELS

  1. Diffuser manufacturer shall furnish solid face blank-off panels where indicated on the drawings and where columns may penetrate the ceiling or where interstitial access is required. Panel to have solid plate installed within extruded aluminum perimeter frame with mitered corners providing a seal between the room and interstitial space. The installing contractor shall cut all fill-in panel(s) for the surgical light column(s), medical gas column(s), and other ceiling mounted apparatus as required on the drawings after this equipment located.
  2. Acceptable model and manufacturer: SFP Series by Precision Air Products Company (800) 404-0931. No substitutes.

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BLANK-OFF PANEL OPTION:

To SPECIFY PERFORATED FILL-IN PANEL, replace SECTION 2.02,. with the following:

  1. Diffuser manufacturer shall furnish perforated blank-off panels, identical in appearance to the panel diffusers, where indicated on the drawings and where columns may penetrate the ceiling or where interstitial access is required. Panel to have solid plate installed behind perforated plate, providing a seal between the room and interstitial space. The installing contractor shall cut all fill-in panel(s) for the surgical light column(s), medical gas column(s), and other ceiling mounted apparatus as required on the drawings after this equipment located.
  2. Acceptable model and manufacturer: PFP Series by Precision Air Products Company (800) 434-0931. No substitutes.

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2.03HEAVY-DUTY WELDED CEILING FRAMING

  1. Laminar flow diffuser manufacturer shall furnish extruded aluminum tee and angle frame assembly suspension system to support diffusers, fill-in panels and light fixtures. The face of the tee shall be 1-1/2" wide x 1-7/16" high and angles shall be ¾” wide x 1-7/16” high.. Minimum wall thickness of the tees and angles shall be 0.125" with a minimum weight of 0.43 lbs. per linear ft. Centerline to centerline dimension of each framing section shall be 0.125” per lineal foot added to the nominal size of the diffuser. Verify exact locations of diffusers, lights, fill-in panels & framing with architectural reflected ceiling plans.
  2. The suspension system shall be factory-welded in sub-assemblies not larger than 6' x 12'. Where framing sub-assemblies butt together for field assembly, the butting angles shall be half tees mechanically-fastened with self-tapping wafer head screws.
  3. All tees shall be pre-punched on 6" centers for attachment to suspending hanger wires or ¼” threaded rod attached on 2’-0” centers at minimum in two directions to structural support members. Systems shall be designed for minimum weight of 10 lbs. per square ft.
  4. Manufacturer shall furnish 1/8" thick closed cell polyethylene gasket tape to be field installed on the frame assembly to provide an airtight seal between diffuser/tee grid or blank-off panel/tee grid interface. Gasket tape shall be field installed by contractor after framing surfaced have been wiped clean, free from any construction dust.
  5. The ceiling framing system shall be finished to match laminar flow diffusers and blank-off panels.
  6. Ceiling framing system to be manufactured by Precision Air Products Company, (800) 404-0931. No substitutes.

PART 3 – EXECUTION

To standard PART 3 specs for GRILLES, REGISTERS AND DIFFUSERS, add the following:

3.01.EXAMINATION

  1. Examine area and conditions under which air outlets and inlets are to be installed for compliance with requirements for installation tolerances and other conditions affecting performance of equipment.
  1. Proceed with installation only after unsatisfactory conditions have been corrected.

3.02.INSTALLATION

  1. Install integrated plenums level and flush in accordance with manufacturer’s written instructions and in accordance with recognized industry practices to ensure that products serve intended function. Mount diffuser frames into ceiling framing and connect each plenum to supply ductwork in accordance with manufacturer’s written instructions and in accordance with recognized industry practices to insure that products serve intended function.
  1. Coordinate with other work, including ductwork and duct accessories, lighting plan, and architectural features as necessary to interface installation of air outlets and inlets with other work.
  1. Install diffusers, registers, and grilles with airtight connections to ducts and to allow service and maintenance of dampers, air extractors, and fire dampers.
  1. Provide balancing dampers on supply duct takeoffs feeding diffuser plenum array in order to adjust air volume to the plenum assembly.

3.3ADJUSTING & BALANCING

  1. After installation, set diffusers, registers, and grilles to air patterns indicated, or as directed, before starting air balancing. For laminar flow integrated diffuser plenum, air volume adjustment is to be performed using dampers located in supply ductwork.
  1. Balancing shall be performed in the field after installation following manufacturer’s recommended procedure.

Form 5-205, effective 7/2015 Page 1 of 4