fin-type radiators will suit the particular building
involved, and the bracketed portions of the
paragraph which are not desired will be deleted.
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Radiators shall consist of metal fins permanently bonded to steel or
nonferrous pipe cores, with threaded or sweat fittings at each end for
connecting to external piping. Radiators shall have capacities not less
than those indicated, determined in accordance with HYI-005. Radiators
shall be equipped with [expanded-metal cover grilles fabricated from black
steel sheets not less than 1.519 mm (16 gauge) 16 gauge, secured either
directly to the radiators or to independent brackets.] [solid-front,
slotted horizontal-top cover grilles fabricated from steel sheets not less
than 1.214 mm (18 gauge) 18 gauge, secured either directly to the radiators
or to independent brackets.] [Solid-front, slotted sloping-top cover
grilles fabricated from black steel sheets not less than 1.519 mm (16
gauge) 16 gauge, independently secured to wall with brackets.]
2.4.1.3
Convectors
Convectors shall be constructed of cast iron or of nonferrous alloys, and
shall be installed where indicated. Capacity of convectors shall be as
indicated. Overall space requirements for convectors shall not be greater
than the space provided. Convectors shall be complete with heating units
and enclosing cabinets having bottom recirculating opening, manual control
damper and top supply grille. Convector cabinets shall be constructed of
sheet steel not less than 0.91 mm (20 gauge) 20 gauge.
2.4.2
Unit Heaters
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NOTE: Indicate capacity of unit heaters and heating
and ventilating units on drawings.
If the project has critical areas where maximum
noise level limits are required, the sentence in
brackets will be retained and the brackets deleted.
The maximum acceptable noise limits for these
critical areas should be determined in NC level or
dBA and should be indicated on drawings. The
sentence in brackets will be deleted for noncritical
areas. Sound values used should be selected based
on a careful study of the design goal by the design
engineer. Recommended sound values for speech
communication, based on normal voice are, according
to ASHRAE-03, as follows: 50 for fair; 44 for very
good; and 38 for perfect speech intelligibility.
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Heaters shall have a heating capacity not in excess of 125 percent of the
capacity indicated. [Noise level of each unit heater for areas noted shall
not exceed the criteria indicated.]
2.4.2.1
Propeller Fan (Type I) Heaters
Heaters shall be designed for suspension and arranged for [horizontal]
[vertical] discharge of air. Casings shall be not less than 0.91 mm (20
gauge) 20 gauge black steel and finished with lacquer or enamel. Suitable
stationary or rotating air deflectors shall be provided to ensure proper
SECTION 15562A
Page 24
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