UFC 3-410-01FA
15 May 2003
amount of ventilation air than may be otherwise required, and increased equipment
operating efficiency.
2-4.4
Where desirable, the designer may incorporate a purge mode into system
design. This mode could be used, for example, to purge the building with outside air
during off-hours or to purge an area of the building undergoing maintenance, such as
painting.
2-4.5
Where practical, locate photocopiers and laser printers in a separate room or
group them together and provide local exhaust. Maintain the separate room at a
negative pressure relative to adjacent areas by transferring air from these adjacent
areas to the separate room. Do not add the air exhausted from the separate room or
local exhaust to the return air or transfer it to any other areas.
2-5
LIFE CYCLE COST ANALYSIS. The designer will evaluate all energy
conservation items that appear to have potential for savings, such as heat recovery for
HVAC and service water heating, economizer cycles, thermal energy storage, desiccant
dehumidification, plastic door strips for loading docks, etc., and include those items in
the design that are life cycle cost effective. Ensure that all operation and maintenance
costs are included in the life cycle cost analysis.
2-6
ENERGY COMPLIANCE ANALYSIS. In order to comply with the Energy
Policy Act of 2005 (EPAct 2005), designs must achieve energy consumption levels that
are a minimum of 30 percent below the level required by ASHRAE Standard 90.1. To
demonstrate compliance with the EPAct 2005, the designer shall prepare an Energy
Compliance Analysis (ECA) that includes a narrative of the path taken to demonstrate
compliance (including reference to each paragraph in ASHRAE 90.1 that make up the
proposed compliance "path"; identification of any software used to prepare calculations,
input to and output from all calculations (with adequate explanation so that a reviewer
can understand what all of the data means); a description of each energy conservation
feature or change considered and the corresponding impact that it had on calculated
energy consumption; and a description of the design proposed as a result of the ECA
along with its calculated energy consumption.
2-7
FILTRATION. For administrative facilities, commercial facilities, and similar
facility occupancy classifications where indoor air quality is of primary concern, it is
preferable to filter the combined supply air, including return and outside air, with a
combination of prefilter(s) with a MERV of 8 and final filter(s) with a MERV of 13 when
tested in accordance with ASHRAE Standard 52.2. Where the use of extended surface
nonsupported pocket (bag) or cartridge filters is unacceptable and satisfactory indoor
quality can be achieved using extended surface filters, the use of prefilters is not
required. Where practical, provide separate filtration or other means to clean the
outdoor air, typically equivalent to that used for the combined air stream, prior to mixing
it with the return air. Due to the decrease in system airflow as the pressure drop across
the filter increases, size fans for the "dirty" filter condition. This will ensure that each fan
has adequate capacity to deliver the design airflow as the filter becomes loaded.
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