Module ID 03201 - Commercial Airside Systems
You may have seen office buildings and shopping
malls with many air conditioning units on
the roof. These are likely to be packaged units
in which the ductwork penetrates the building.
Large buildings have different needs than small
buildings. For example, some zones in the building
may be calling for heat, while others are calling
for cooling, and others are making no demands.
The system design must accommodate these differences.
In commercial systems, it is common to
find single systems serving multiple zones, with
each zone having its own comfort control device.
These applications require special air distribution
equipment not commonly found in residential
applications. (12.5 hours)
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Module ID 04303 - Principles of Airflow
Before an air distribution system is manufactured,
mechanical engineers make calculations,
work through options, and often negotiate with
other engineers in other specialties to produce the
plans. Value engineering–comparing projected
costs to the return on investment–is also a significant
factor. Understanding principles of airflow
will help craftworkers better appreciate the design
process and recognize why systems are designed
as they are. This module explains how airflow is affected
by duct size, shape, and material of construction.
Features such as turning vanes that increase the
efficiency of airflow in an elbow, minimize turbulence,
and ensure the best possible airflow are
explored. Trainees are provided with the necessary
knowledge to fabricate and install systems
from a performance perspective and learn why
this is important to building owners and their
occupants. (25 hours)
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Module ID 04308 - Using Construction Drawings in Sheet Metal
Construction drawings and documents govern
the way a project is accomplished. Using these
documents will not only guide the construction
process and outline the required results, but it
is also useful in the preparation of equipment
schedules, material takeoffs, and craft scheduling.
This module explains how to put knowledge of
construction drawings and documents to work as
a sheet metal fabricator or installer, emphasizing
the ways in which they usually interact with the
drawings. (30 hours)
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Module ID 04305 - Sheet Metal Job Specifications
Plans, specifications, and submittals are documents
that describe in exact detail how a building
is to be constructed and the required characteristics
of the materials used. The specifications document
outlines instructions and standards for how
the work is to be performed, while submittals
specify the equipment to be installed, and both
must be followed closely. It is critical that the various
trades on site coordinate their work with one
another prior to the beginning of construction. It
is also important to coordinate the order in which
things are installed so that one trade’s work does
not hinder access for another trade that will be
working later in the same space. This module will
cover how the specifications and submittal documents
are applied when accomplishing work for a
specific job. (20 hours)
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Module ID 04402 - Air Testing and Balancing
Even when a forced-air comfort system is properly
installed and operating, the air must be properly
distributed to the spaces. Therefore, after the
system is installed and running, the air must be
properly balanced. This process requires a deep
understanding of airflow fundamentals and the
ability to use specialized test instruments to measure
air pressures, velocity, and volume. (30 hours)
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Module ID 19202 - Blanket Insulation for Ducts
Fiberglass is what most people think of when they
think about insulation, specifically the pink, fluffy
fiberglass usually found in home attics. While the
fibrous pink insulation is not generally used in
the mechanical insulation trade, there are several
types of fiberglass insulation that are. This module
will introduce you to the blanket form of glass
fiber insulation. (7.5 hours)
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Module ID 19203 - Board Insulation For Ducts
There are two types of insulation primarily used
on duct systems: fiberglass blanket and fiberglass
board. They are somewhat similar in construction.
Fiberglass blanket is generally easier to work with
but is less durable. Fiberglass board, the subject of
this module, requires more effort to fit to the duct
but is longer lasting. (20 hours)