connectors are needed to correct lateral, parallel,
and angular misalignment, their use will be limited
to maximum offset as recommended, in writing, by the
manufacturer.
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Pre-insulated flexible connectors and flexible duct shall be attached to
other components in accordance with the latest printed instructions of the
manufacturer to ensure a vapor tight joint. Hangers, when required to
suspend the connectors, shall be of the type recommended by the connector
or duct manufacturer and shall be provided at the intervals recommended.
3.1.6
Sleeved and Framed Openings
Space between the sleeved or framed opening and the duct or the duct
insulation shall be packed as specified in Section 07840 FIRESTOPPING for
fire rated penetrations. For non-fire rated penetrations, the space shall
be packed as specified in Section 07920 JOINT SEALANTS.
3.1.7
Metal Ductwork
Installation shall be in accordance with SMACNA HVAC Duct Const Stds unless
otherwise indicated. Duct supports for sheet metal ductwork shall be in
accordance with SMACNA HVAC Duct Const Stds, unless otherwise specified.
Friction beam clamps indicated in SMACNA HVAC Duct Const Stds shall not be
used. Risers on high velocity ducts shall be anchored in the center of the
vertical run to allow ends of riser to move due to thermal expansion.
Supports shall be attached only to structural framing members and concrete
slabs. Supports shall not be anchored to metal decking unless a means is
provided and approved for preventing the anchor form puncturing the metal
decking. Where supports are required between structural framing members,
suitable intermediate metal framing shall be provided. Where C-clamps are
used, retainer clips shall be provided. Where threaded rods are used, they
not be formed or bent.
3.1.8
Fibrous glass Ductwork
Installation shall be in accordance with the manufacturer's written
recommendations unless otherwise required in NAIMA AH116. Duct supports
for fibrous glass ductwork shall conform to NAIMA AH116. In those cases
not covered in NAIMA AH116, the written recommendation of the fibrous duct
manufacturer shall be followed.
3.1.9
Air filters shall be installed [in heater casings] [in return air ducts at
furnaces] [in return air grilles]. Fans or blowers shall not be operated
until filters are installed. After completion of tests and before the
building is accepted by the Government, the Contractor shall [furnish a new
second set of replaceable filters, where utilized] [clean the permanent
type filters].
3.1.10
Dust Control
To prevent the accumulation of dust, debris and foreign material during
construction, temporary dust control protection shall be provided. The
distribution system (supply and return) shall be protected with temporary
seal-offs at all inlets and outlets at the end of each day's work.
Temporary protection shall remain in place until system is ready for
SECTION 15566A
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