Flushduct®
Flush Infloor Raceway
Product Specifications
SECTION 16130
FLUSHDUCT FLUSH INFLOOR RACEWAY
PART 1 GENERAL
1.1
SCOPE
Work under this section includes all labor and materials, which are required for the completion
of the infloor distribution system, as shown on drawings and as specified. The Conditions of
the Contract and Division 1 apply to this section as if repeated herein. Work includes, but is
not necessarily limited to the following principal items.
1.2
RELATED SECTIONS
1.2.1
1.3
1.4
Section 16132 – Trenchduct Feeder System (if applicable)
REFERENCES
The editions of specifications and standards referenced herein, published by the
following organizations, apply to the work only to the extent specified by the reference.
1.3.1
Underwriters Laboratories Inc. (UL) “Standards of Safety UL884”
1.3.2
NEC. “National Electrical Code”
SUBMITTALS
The following information shall be submitted to the architect and/or specifying electrical,
communication, or structural engineer.
1.4.1 Manufacturer’s Data
The manufacturer shall submit product specifications such as technical literature and installation
instructions for the junction box feeder and accessories. The manufacturer shall submit proof of
UL compliance regarding Flushduct System.
1.5
QUALITY ASSURANCE
Flushduct with the accessories to provide a complete cellular floor feeder system furnished by
Walker Systems, Inc., Williamstown, WV, a Wiremold Company, shall establish the minimum
requirement for function, dimension, and appearance.
The materials, products, and equipment specified in this section establish a standard of
quality, required function, dimension, and appearance to be met by any proposed substitution.
1.6
SUBSTITUTIONS
No substitution will be considered unless written request for approval has been submitted
by the bidder and has been received by the architect at least ten days prior to the date for
receipt of bids.
Each such request shall include the name of the materials or equipment for which it is to be
substituted and a complete description of the proposed substitute including drawings, cuts,
mock-ups, performance and test data, compliance with codes, and approvals and any other
information necessary for evaluation.
PART 2 PRODUCT
2.1
ACCEPTABLE PRODUCT
Flushduct, a product of Walker Systems, Inc, a Wiremold Company. Other suppliers must submit
ten days prior for approval.
2.1.1 Flushduct:
As shown on the drawings consisting of a three-duct, 9 3/8" wide x 1 1/4" deep [238mm x 32mm],
flush underfloor duct unit.
2.1.1.1. The three-ducts shall be contiguous (welded together) while maintaining complete
isolation of services
2.1.1.2 The underfloor duct units and accessories shall be fabricated from steel sheets
conforming to ASTM A653, Grade A, or they shall be die-cast. Duct capacities shall be
3.31 sq. in. [2135mm2] each.
2.1.1.3 Flushduct Units shall be manufactured in 10' [3m] lengths.
2.1.1.4 Each Unit shall be fabricated from 14-gauge steel conforming to UL Standard
for Safety Number UL 884 requirements.
2.1.2 Presets:
Presets shall be located on 24" [609mm] centers with the center duct having a staggered
location preset.
2.1.2.1 Each preset shall be capped with a 1 5/8" [41mm] diameter metal screw plug.
2.1.3
Junction Boxes:
2.1.3.1 Junction Boxes shall be fabricated from cast steel.
2.1.3.2 Junction box must be capable of withstanding a 200-lb load [91kg] with less
than .040" [1.0mm] of temporary deflection.
2.1.3.3 The junction box shall have a nonadjustable 1/4" [6.4mm] thick flat steel cover plate.
2.1.3.4 The junction boxes shall be supplied with partitions, as necessary, to maintain
complete isolation of services.
2.1.3.5 Each junction box shall have three side openings to accept a three-duct flushduct unit.
2.1.3.6 Each junction box shall have four corner conduit adapters that provide access
to the two outside runs of duct.
2.1.3.7 The junction boxes shall have leveling legs at each corner for prepour adjustment.
2.1.4
Trenchduct Crossunders (If Applicable):
2.1.4.1 The Flushduct Units shall crossunder the trenchduct at specified locations to
establish the distribution run spacing.
2.1.4.2 Each flushduct crossunder shall be attached to the bottom pan of the trenchduct
using a tack weld.
2.1.4.3 Factory cut openings in the bottom pan of the trenchduct shall align with factory cut
openings in the top of each flushduct duct.
2.1.4.4 Each opening in the trench and flushduct at the crossunder location shall be grommeted
at the factory to prevent wire stripping.
2.1.4.5 Offsets are available to raise the top surface of the flushduct to a level where it
will be flush with the cover plates of the trenchduct and flush with the surface of the floor.
PART 3 EXECUTION
3.1
INSTALLATION
3.1.1 Flushduct Installation
Install distribution raceway system and accessories in accordance with the manufacturer’s
recommendation, installation instructions, the final installation drawings and as herein specified.
Electrical module lines shall be laid out on the concrete base in each building bay and the raceway
units shall be located in strict accordance with the electrical drawings in order to maintain the
electrical module spacing.
3.1.2 Placement
Place raceway system on the supporting framework and adjust to final position with proper end
bearing and alignment at the butt joints before permanent fastening. All joints shall be secured
with grounding screws.
3.1.3 Fastening
Permanently fasten the raceway supports to the supporting framework with screws and nails.
Spacing between support shall not exceed 5' [1524mm].
3.1.4 Adjustment
The raceway supports and the raceway distribution system shall be adjusted so the top
of the raceway is even with the screed line.
3.1.5 Loading
Do not use the installed raceway system for working platforms or walkways.
3.1.6 Clearing System
After placing of concrete fill and before wiring is installed, remove debris and other foreign materials
from the raceway. If moisture is present, remove one cover plate as necessary to allow air circulation.
3.2
FIELD QUALITY CONTROL
3.2.1 Concrete Placement and Procedure
Concrete topping shall be as indicated on the drawings and as specified under Section 03300.
No concrete containing chlorides from any source shall be placed over or in contact with infloor units.
Before concrete placement, make a final inspection of the entire Flushduct System. Any gaps
in the system shall be sealed to prevent mortar or concrete from entering.
Concrete design shall be in accordance with American Concrete for Buildings (ACI 301-99) and
ACI Building Code Requirements for Reinforced Concrete (ACI 318-02). Concrete placement
shall follow proper and accepted industry practice and be in accordance with ACI Recommended
Practice for Measuring, Mixing, Transporting, and Placing Concrete (ACI 304R-00).
Concrete must be vibrated at all headers, junction boxes, and raceways to ensure that the concrete
completely fills all voids under the Flushduct System. Care must be taken not to over vibrate. Over
vibration will cause segregation of materials in the concrete mix, which in turn leads to weakening
of concrete strength.
3.2.2 Shrinkage
Shrinkage and temperature reinforcement above the Flushduct and Junction Box System shall be in
accordance with ACI 318-02. Care shall be taken during concrete placement and, in particular, during
concrete vibration, to prevent rising of top reinforcement within the slab.
3.2.3 Concrete Finishing
Contractors placing the concrete shall carefully hand finish a minimum of 24" [610mm] adjacent to junction
box access openings and along edges of Flushduct Raceway so that the top of finished concrete, junction
box access units, and Flushduct Raceway are flush.
3.3
FIELD TESTING AND INSPECTION
Specified in Section 01410.
3.4
PROTECTION
Protect installation of floor system from damage. Do not move or transport equipment or heavy
traffic over system during construction period, without first installing ramps. Ramps shall be
designed so that imposed loads are not transferred to system components. Components of
the system, which are damaged during construction, shall be replaced at no cost to the owner
or manufacturer.
Wiremold / Legrand
U.S. and International:
60 Woodlawn Street  West Hartford, CT 06110
1-800-621-0049  FAX: 860-232-2062  Outside U.S.: 860-233-6251
Canada:
570 Applewood Crescent  Vaughan, Ontario L4K 4B4
1-800-723-5175  FAX: 905-738-9721
 2005 The Wiremold Company All Rights Reserved
ED748R2 – Updated January 2005 – For latest specs visit www.wiremold.com