Rev 2

Furnish and install where shown on drawings, Sigma Corporation finned-tube assemblies as described in this specification.  Manufacturer must be IBR approved.
Enclosure 
The mullion enclosure shall be provided as shown on drawings. Enclosure shall be XX inches [YY mm] tall and XX inches [YY mm] deep.
Enclosure shall be manufactured from {18Ga, 16 Ga, or 14Ga }  {steel, embossed steel pattern ZZZZ, brushed aluminum, or stainless steel}  and finished with a {powder coat baked enamel finish, or primer finish suitable for field painting}. Color shall be {selected from manufacturer’s standard color charts, or custom as selected by Architect}.
The mullion enclosure shall be suitably reinforced to withstand a loading of 150 lbs per linear foot [223 kg/m]. The enclosure shall be continuous wall to wall or as shown on the drawings.  Enclosure shall be fabricated typical to the window modules with a {recessed, or flush} joint at the window mullions. {<for recessed mullion only> Recessed joint shall have a reveal of XX in [YY mm] and shall align with the window mullions.} {<for flush type mullion only> Flush type mullions shall be XX in [YY mm] and shall align with the window mullions.}
Enclosure panels and mullions shall be made in sections to match window modules. Panels and mullions shall have a 0.75 inch [19mm] return edge around the perimeter to provide rigidity.
The enclosure covers shall be manufactured in {1, or 2} pieces as depicted in drawings. {<pick one> (1) Cover shall be removable by hand without any tools (2) Covers shall be fastened with {standard fasteners, torx security fasteners, or ¼ turn captive fasteners}.
The top outlet of the enclosures shall have {stamped louver grilles, or aluminum bargrill} that extends the entire length of panels.
The inlet of enclosure shall be {open, provided with stamped louver grilles, or provided with aluminum bargrill }.
Manufacturer to provide all accessories (mullion endcaps, trims, corners, hangerstrip, brackets, etc.) to realize project.
In conditions where enclosure is fastened to curtain wall structure, it shall be manufacturer’s responsibility to coordinate and obtain approval of method of attachment of enclosure to structure from curtain wall supplier. In multistory curtain wall configurations, special attention shall be given to situations where the enclosure bridges the expansion joint of the curtain wall.
{<optional> Mullion support brackets shall be designed to accommodate sound barrier partitions. Contractor shall provide and install sound barrier partition where shown on drawings.}
Element
All copper/aluminum-heating elements shall be manufactured with {1.25” [32mm], 1” [25mm], or 0.75” [19mm]} diameter, seamless copper tubing mechanically expanded into the diameter of the equally spaced {4” x 4” [102mm x 102mm], or 4” x 2.75” [102mm x 70mm]} aluminum fins spaced 48 fins/foot [160 fins per meter].  The element shall be swaged on one end.  Provide support for elements on a minimum of 36” [900mm] centers.
Performance
Enclosure-element combination shall provide a minimum capacity of XXXX BTU/Hr/Ft (YYYY W/m) at  XXX DegF [YYY DegC]  Average Water Temperature, XXX DegF [YYY DegC] Entering Air Temperature. 
Mullion

Sample Specification

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