temperature or humidity requirements exist. Ensure
that requirements added to text from ASME AG-1 are
essential to customer's needs, as this standard is
not intended for routine commercial applications,
and may add unnecessary expense to the project.
When used, ASME AG-1 should be added to paragraph
REFERENCES.
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HEPA filters shall meet the requirements of IEST RP-CC-001.3 and shall be
individually tested and certified to have an efficiency of not less than
[95] [99.97] percent. Initial resistance at [_____] m/s fpm shall not
exceed [_____] Pa inches water gauge. Filters shall be constructed by
pleating a continuous sheet of filter medium into closely spaced pleats
separated by corrugated aluminum or mineral-fiber inserts, strips of filter
medium, or by honeycomb construction of the pleated filter medium.
Interlocking, dovetailed, molded neoprene rubber gaskets of 5-10 durometer
shall be cemented to the perimeter of the [upstream] [downstream] face of
the filter cell sides. Adhesive sealer shall be of self-extinguishing
rubber-base type or other materials conforming to fire hazard
classification specified in Section 15080 THERMAL INSULATION FOR MECHANICAL
SYSTEMS. Filter cell sides shall be [19 mm 3/4 inch thick exterior grade
fire-retardant plywood] [cadmium plated steel] [galvanized steel] assembled
in a rigid manner. Overall cell side dimensions shall be correct to 2 mm
1/16 inch, and squareness shall be maintained to within 3.2 mm 1/8 inch.
Each holding frame shall use spring loaded fasteners or other devices to
seal the filter tightly within it and to prevent any bypass leakage around
the filter during its installed life. Air capacity and the nominal depth
of the filter shall be as indicated. Each filter shall be installed in a
factory preassembled side access housing or a factory-made sectional
supporting frame as indicated. Provide prefilters of the type,
construction and efficiency indicated.
2.7.3.9
Holding Frames
Fabricate frames from not lighter than 1.6 mm 16 gauge sheet steel with
rust-inhibitor coating. Equip each holding frame with suitable filter
holding devices. Holding frame seats shall be gasketed. All joints shall
be airtight.
2.7.3.10
Filter Gauges
Filter gauges shall be dial type, diaphragm actuated draft and shall be
provided for all filter stations, including those filters which are
furnished as integral parts of factory fabricated air handling units.
Gauges shall be at least 98 mm 3-7/8 inches in diameter, shall have white
dials with black figures, and [graduations] [shall be graduated in 0.0025
kPa 0.01 inch of water,] and shall have a minimum range of 0.25 kPa 1 inch
of water beyond the specified final resistance for the filter bank on which
each gauge is applied. Each gauge shall incorporate a screw operated zero
adjustment and shall be furnished complete with two static pressure tips
with integral compression fittings, two molded plastic vent valves, two 1.5
m 5 foot minimum lengths of 6.35 mm 1/4 inch diameter [aluminum] [vinyl]
tubing, and all hardware and accessories for gauge mounting.
2.8
AIR HANDLING UNITS
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NOTE: To prevent condensate overflow, calculate the
SECTION 15895
Page 38
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