surface nonsupported pocket filter or the combination dry
agglomerator/automatic renewable media (roll) type, as indicated (except as
modified). Each dry agglomerator electrostatic air filter shall be
supplied with the correct quantity of fully housed power packs and equipped
with silicon rectifiers, manual reset circuit breakers, low voltage safety
cutout, relays for field wiring to remote indication of primary and
secondary voltages, and lamps mounted in the cover to indicate these
functions locally. Power pack enclosure shall be equipped with external
mounting brackets, and low and high voltage terminals shall be fully
exposed with access cover removed for ease of installation. Furnish
interlock safety switches for each access door and access panel that
permits access to either side of the filter, so that the filter will be
de-energized in the event that a door or panel is opened. Ozone generation
within the filter shall not exceed five parts per one hundred million parts
of air. High voltage insulators shall be located outside the moving air
stream or on the clean air side of the unit and shall be serviceable.
Ionizer wire supports shall be fully exposed and ionizer wires shall be
furnished precut to size and with formed loops at each end to facilitate
ionizer wire replacement. Agglomerator cell plates shall allow proper air
stream entrainment of agglomerates and prevent excessive residual dust
build-up. Cells shall be open at the top and bottom to prevent
accumulation of agglomerates which settle by gravity. Where the dry
agglomerator electrostatic filter is indicated to be the automatic
renewable media type, the storage section shall utilize a horizontal or
vertical travelling curtain of adhesive-coated bonded fibrous glass for dry
agglomerator storage section service and supplied in 19.8 m 65 foot lengths
in convenient roll form. Storage section construction and roll media
characteristics shall otherwise be as specified for automatic renewable
media filters. Initial air flow resistance of the dry
agglomerator/renewable media combination, after installation of clean
media, shall not exceed 62.3 Pa 0.25 inch water gauge at 2.54 m/s 500 fpm
face velocity. The MERV of the combination shall be not less than 15 when
tested according to ASHRAE 52.2 at an average operating resistance of 125
Pa 0.50 inch water gauge. Where the dry agglomerator electrostatic filter
is indicated to be of the extended surface nonsupported pocket filter type,
the storage section shall be as specified for extended surface
non-supported pocket filters, with sectional holding frames or side access
housings as indicated. Initial air flow resistance of the dry
agglomerator/extended surface nonsupported pocket filter section
combination, after installation of clean filters, shall not exceed 162 Pa
0.65 inch water gauge at 2.54 m/s 500 fpm face velocity. The MERV of the
combination shall be not less than 16 when tested according to ASHRAE 52.2.
Front access filters shall be furnished with full height air distribution
baffles and upper and lower mounting tracks to permit the baffles to be
moved for agglomerator cell inspection and service. When used in
conjunction with factory fabricated air handling units, side access
housings shall be supplied which have dimensional compatibility.
2.7.3.8
High-Efficiency Particulate Air (HEPA) Filters
**************************************************************************
NOTE: Use high-efficiency particulate air filters
in CLEAN ROOMS (White Rooms or Dust Controlled
Facilities), clean work stations, and for critical
areas of hospitals. Show the efficiency of the
prefilter on the drawings. The efficiency will be
sufficient for the anticipated contamination load
and the degree of prefiltration required. ASME AG-1
may be referenced either all or in part when extreme
SECTION 15895
Page 37
Previous Page
