indicated and shall have a MERV of 5 when tested according to ASHRAE 52.2.
Initial resistance at 2.54 m/s 500 fpm shall not exceed 0.09 kPa 0.36
inches water gauge. Filters shall be UL Class 2. Media shall be nonwoven
cotton and synthetic fiber mat. A wire support grid bonded to the media
shall be attached to a moisture resistant fiberboard frame. All four edges
of the filter media shall be bonded to the inside of the frame to prevent
air bypass and increase rigidity.
2.7.3.2
Extended Surface Nonsupported Pocket Filters
Filters shall be [750] [_____] mm [30] [_____] inch depth, sectional,
replaceable dry media type of the size indicated and shall have a MERV of
13 when tested according to ASHRAE 52.2. Initial resistance at [2.54]
[_____] m/s [500] [_____] fpm shall not exceed [0.1125] [_____] kPa [0.45]
[_____] inches water gauge. Filters shall be UL Class 1. Media shall be
fibrous glass, supported in the air stream by a wire or non-woven synthetic
backing and secured to a galvanized steel metal header. Pockets shall not
sag or flap at anticipated air flows. Each filter shall be installed [with
an extended surface pleated panel filter as a prefilter] in a factory
preassembled, side access housing or a factory-made sectional frame bank,
as indicated.
2.7.3.3
Cartridge Type Filters
Filters shall be 305 mm 12 inch depth, sectional, replaceable dry media
type of the size indicated and shall have a MERV of 13 when tested
according to ASHRAE 52.2. Initial resistance at [2.54] [_____] m/s [500]
[_____] fpm shall not exceed [14] [_____] kPa [0.56] [_____] inches, water
gauge. Filters shall be UL class 1. Media shall be pleated microglass
paper media with corrugated aluminum separators, sealed inside the filter
cell to form a totally rigid filter assembly. Fluctuations in filter face
velocity or turbulent airflow will have no effect on filter integrity or
performance. Each filter shall be installed [with an extended surface
pleated media panel filter as a prefilter] in a factory preassembled side
access housing, or a factory-made sectional frame bank, as indicated.
2.7.3.4
Sectional Cleanable Filters
**************************************************************************
NOTE: Delete washing and charging racks when not
required.
**************************************************************************
Cleanable filters shall be [25] [50] mm [1] [2] inches thick. Viscous
adhesive shall be provided in 20 L 5 gallon containers in sufficient
quantity for 12 cleaning operations and not less than one L one quart for
each filter section. One washing and charging tank shall be provided for
every 100 filter sections or fraction thereof. Each washing and charging
unit shall consist of a tank and [single] [double] drain rack mounted on
legs. Drain rack shall be provided with dividers and partitions to
properly support the filters in the draining position.
2.7.3.5
Replaceable Media Filters
Replaceable media filters shall be the [dry-media] [viscous adhesive] type,
of the size required to suit the application. Filtering media shall be not
less than 50 mm 2 inches thick fibrous glass media pad supported by a
structural wire grid or woven wire mesh. Pad shall be enclosed in a
holding frame of not less than 1.6 mm 16 gauge galvanized steel, and
SECTION 15895
Page 35
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