[Provide vibration isolators with in-series, contained, steel springs,
chloroprene elastomer elements, and fasteners for connecting to building
structure attachments. Devices shall be loaded by support system in
operating condition to produce required static spring deflection without
exceeding 75 percent of device maximum load rating.] [Conform to Section [
15070N] MECHANICAL SOUND VIBRATION AND SEISMIC CONTROL.]
2.9
DUCTWORK, DUST [AND FUME] COLLECTION
2.9.1
General Requirements for Dust [and Fume] Collection Ductwork
**************************************************************************
NOTE: Delete all welded seams and flanged joints
when not required. However, factors such as water
intrusion under negative pressure in weather
exposure should be considered when construction
which is not leak-tight is permitted for the
project. Duct conveying fumes subject to
condensation should be leak-tight.
**************************************************************************
[Where specified or indicated] [_____] fabricate system ductwork from black
carbon steel [, with welded seams and flanged and gasketed joints].
Construct duct to handle [_____] [wood dust] particulate with an influent
loading of [15,000 grains per [standard liter per second (L/s)] [actual
L/s]] [7,000 grains per [standard cubic feet per minute (scfm)] [actual
cubic feet per minute (acfm)] [_____]]. Provide ductwork in accordance
with best practice recommendations and requirements of SMACNA Rectangle
Duct Const and SMACNA Rnd Duct Const, for [Class I] [Class II] [Class III]
[Class IV] duct and requirements specified or indicated.
2.9.2
Fabrication of Dust [and Fume] Collection Ductwork
**************************************************************************
NOTE: Delete all welded seams and flanged joints
when not required. However, factors such as water
intrusion under negative pressure in weather
exposure should be considered when construction
which is not leak-tight is permitted for the
project. Duct conveying fumes subject to
condensation should be leak-tight.
**************************************************************************
Provide indicated sizes, lengths and configuration without deviation unless
otherwise approved. Assemble ductwork airtight [as defined under paragraph
entitled "Ductwork Structural Integrity and Leakage Testing," in this
section] and include necessary reinforcements, bracing, supports, framing,
gasketing and fastening to guarantee rigid construction and freedom from
vibration, airflow induced motion, and excessive deflection. For [_____]
system, provide SMACNA Class 1 construction with any of the reference
standard seams and connections being acceptable [, except [_____]]. For
[_____] system, provide SMACNA Class [2] [3] [4] construction with welded
duct and fitting seams and welded companion angle or Van-Stone flanges.
Welding shall conform to requirements specified herein. Provide flanges at
[branches] [hoods,] [equipment] [and] [enclosure connections,] where
necessary for ease of access to equipment or maintenance disassembly, and
where indicated. Provide elbows and fittings a minimum 2 gages heavier
than straight ducts of equal diameter.
SECTION 15801N
Page 26
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