TAB Journal Spring 2014 - (Page 8)
The Trouble With
Canned Specs
John A Balanik, TBE
R.H. Cochran and Associates, Inc.
any times in the industry, the same specifications
are being applied to several different projects.
These can be referred to as "canned specs".
For whatever reason, whether to save time or
money or both, a very involved specification will be applied to
a straightforward job. What applies to a school or library may
not work for a furnace project.
Recently, testing and balancing was conducted at a veteran's
homeless shelter, which utilized several residential-type
furnaces. The furnaces served VVT boxes with bypass type
static pressure control. These units were equipped with outside
air duct connections at the return air to each furnace. Overall,
it was a straightforward project. The units were balanced with
some minor complications that were corrected by the installing
contractor, allowing work to be completed in a timely manner.
8
Several months after completion, word was received from the
mechanical contractor that the architect would not release the
retainer to the contractor. His reasoning was that according to
the specifications, a building flush was to be performed prior
to occupancy.
Most times a building flush is performed with air handling
units that have an economizer function, The economizer is
placed into a very high outside air setting to flush the building
of odors, VOC's and toxins from drying paints and adhesives.
Normally, the economizer is set to 60-100% outside air for a
set period of time. The amount of time required is determined
by the Engineer or Commissioning Authority. During this
time, the unit or units must run continuously without being
disrupted. If the units are shut down for any reason, the flush
begins again from the beginning.
TAB Journal Spring 2014
Table of Contents for the Digital Edition of TAB Journal Spring 2014
Indirectly Determining Air Volume
Calibration and Balancing of Phoenix Valves in Laboratories
The Trouble with Canned Specs
Environmental Considerations of the Southwest
Airflow Measuring Station Considerations
Putting the Proper "SPIN" on Things
Chasing the Air
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