USACE / NAVFAC / AFCESA / NASA UFGS-23 41 13 (August 2008)
-------------------------------
Preparing Activity: NASA Superseding
UFGS-23 41 13.00 40 (July 2007)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 23 41 13
PANEL FILTERS
08/08
NOTE: This specification covers the requirements for This section covers basic
types of filters for use with air handling equipment.
Specify any required extra media, filters, and adhesive.
Indicate overall physical features, dimensions, ratings, service requirements,
and equipment weights on drawings.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS (ASHRAE)ASHRAE 52.1(1992; Interpretation 1 2007) Gravimetric and Dust-Spot Procedures for Testing Air-Cleaning Devices Used in General Ventilation for Removing Particulate Matter][ASME INTERNATIONAL (ASME)ASME AG 1(2003; Errata 2004; Addenda 2005; Addenda 2007) Code on Nuclear Air and Gas Treatment][ASTM INTERNATIONAL (ASTM)ASTM A 526/A 526M(1990) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process, Commercial QualityASTM A 653/A 653M(2008) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip ProcessASTM D 92(2005a) Standard Test Method for Flash and Fire Points by Cleveland Open Cup TesterASTM E 84(2008a) Standard Test Method for Surface Burning Characteristics of Building Materials][NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (NIST)NIST PS 1(2007) Construction and Industrial Plywood][U.S. DEPARTMENT OF DEFENSE (DOD)MIL-F-29177(Rev A; CANC Notice 1) Filter, Air-Extended Area, Initial InstallationMIL-STD-282(Basic, Notice 4) Filter Units, Protective Clothing, Gas-Mask Components and Related Products: Performance-Test Methods][U.S. GENERAL SERVICES ADMINISTRATION (GSA)FED-STD-209(Rev C) Clean Room and Work Station Requirements, Controlled Environment][UNDERWRITERS LABORATORIES (UL)UL 586(1996; Rev thru Aug 2008) Standard for High-Efficiency Particulate, Air Filter UnitsUL 723(2008) Standard for Test for Surface Burning Characteristics of Building MaterialsUL 900(2004; Rev thru Nov 2007) Standard for Air Filter Units]1.2 SUBMITTALS
NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only. When used, a designation following the
"G" designation identifies the office that will review the submittal for the Government.] Submit the following
in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Submit Installation Drawings in accordance with the paragraph entitled, "Holding Frame Installation,"
of this section.
SD-03 Product Data
Submit Equipment and Performance Data for air filters in accordance with paragraph entitled,
"General Requirements," of this section.
Submit Manufacturer's catalog data for the following items:
Air Filters
Filter Gages
Manometers
SD-06 Test Reports
Submit Test Reports for air filters in accordance with paragraph entitled, "Tests," of this
section.
SD-07 Certificates
Submit certificates for the following items showing conformance with the reference standards
contained in this section.
Air Filters
Filter Gages
Manometers
1.3 GENERAL REQUIREMENTS
NOTE: If Section 23 00 00 AIR SUPPLY, DISTRIBUTION, AND EXHAUST SYSTEMS is
not included in the project specification, applicable requirements therefrom
should be inserted and the following paragraph deleted.
Section 23 00 00 AIR SUPPLY, DISTRIBUTION, AND EXHAUST SYSTEMS applies to work specified in this section.
Submit Equipment and Performance Data for air filters consisting of use life, system functional flows, safety
features, and mechanical automated details. Also submit curves indicating tested and certified equipment responses
and performance characteristics.
PART 2 PRODUCTS
2.1 FILTERS
Provide Air filters with a net effective filtering area and a face area to provide the required airflow at the
indicated initial pressure-drop.
Provide sufficient clearance for maintenance and operation in and around filter assembly.
Construct filter-holding frames of [extruded aluminum] [type 300 corrosion-resistant steel] [corrosion-resistant
coated 1.6 millimeter 16-gage (minimum) steel] [not less than 1.6 millimeter 16-gage galvanized carbon steel
conforming to ASTM A 653/A 653Mwith not less than 0.38 kilogram of zinc per square meter 1.25 ounces of zinc
per square foot of two-sided surface] [wood-pulp products]. Provide frame assemblies and fasteners of corrosion-resistant
metal or carbon steel with a corrosion-resistant finish to preclude surface degradation.
[Make viscous-impingement framed panel filter gaskets from a material inert to filter impregnants. Minimum thickness
after compression shall be 3 millimeter 1/8 inch.]
[Provide dry filter gaskets of closed-cell foamed neoprene or urethane elastomer of sufficient hardness to compress
to not more than 40 percent of original thickness when filter is in position.]
2.1.1 Filters, Disposable Type
Listed below is the minimum acceptable performance for the air filter:
INITIAL DUST-HOLDING
DIMENSIONS RESISTANCE ARRESTANCE CAPACITY
(MILLIMETER) (pascal) (PERCENT) (GRAM/SQ FT)
350 by 500 10 65 1560
by 25
400 by 500 10 65 1560
by 25
400 by 650 10 65 1560
by 25
500 by 500 10 65 1560
by 25
500 by 650 10 65 1560
by 25
400 by 500 20 75 2050
by 25
400 by 650 20 75 2050
by 50
500 by 500 20 75 2050
by 50
500 by 650 20 75 2050
by 50
INITIAL DUST-HOLDING
DIMENSIONS RESISTANCE ARRESTANCE CAPACITY
(INCHES) (INCH WG) (PERCENT) (GM/SQ FT)
14 by 20 0.04 65 145
by 1
16 by 20 0.04 65 145
by 1
16 by 25 0.04 65 145
by 1
20 by 20 0.04 65 145
by 1
20 by 25 0.04 65 145
by 1
16 by 20 0.08 75 190
by 2
16 by 25 0.08 75 190
by 2
20 by 20 0.08 75 190
by 2
20 by 25 0.08 75 190
by 2
For all sizes of filters, final resistance value shall be 125 pascal 0.50 inch, air volume shall be 0.6 cubic
meter per second 1,200 cubic feet per minute, and airflow velocity shall be 1.5 meter per second 300 feet per
minute.
2.1.2 Filters, Cleanable Type
Provide nonwoven synthetic-fabric-type filtering element, supported on rigid pleats of suitable grid material.
Seal filter element into an enclosing frame of rigid chipboard, providing a unit that will not rack. Overall
depth shall be nominally [50 millimeter] [100 millimeter] [2 inches] [4 inches]. Initial pressure drop at a
face velocity of 2.5 meter per second 500 fpm shall be [62] [55] pascal [0.25] [0.22] inch wg. Average dust-spot
efficiency shall be [10 percent] [18 percent] and arrestance shall be [85 percent] [87 percent] when filter is
operated to a final pressure drop of 250 pascal 1 inch wg. Under these circumstances, dust-holding capacity
shall be [485] [750] grams per square meter [45] [70] grams per square foot of face area.
Test method shall be in accordance with ASHRAE 52.1.
2.1.3 Filters, Replaceable Type
Provide filters that conform to MIL-F-29177, Type I or Type II. Base filter efficiency on ASHRAE 52.1. Efficiency,
by definition, is dust-spot efficiency using atmospheric dust. Arrestance is weight efficiency using test dust.
Provide type III filter arrestance efficiencies in accordance with MIL-STD-282 DOP test.
Provide each air filter consisting of a permanent corrosion-resistant holding frame and a replaceable factory-assembled
filter element. Supply permanent holding frame with suitable gaskets designed to maintain a positive pressure
seal between the frame and the filter element(s).
Design and construct air filters to facilitate field maintenance. Adjustments and replaceable accessories must
be readily accessible. Conditions which may be hazardous to personnel or deleterious to equipment is not permitted.
Provide nonallergenic and nontoxic filter element, with no detectable odor. Filter element shall have no adverse
effect on the health of personnel handling or served by the filter element.
Use adhesive coatings on filters with a flashpoint of not less than 163 degrees C 325 degrees F and conform to
ASTM D 92.
[Provide Type 1, Grade A filters with 30 percent commercially rated efficiency that conforms to UL 900, Class
2, and requirements specified herein. Filters, when operated at rated capacity of [_____] cubic meter per second
cfm, shall have an initial pressure drop of not more than [_____] pascal [_____] inch wg, and final pressure
drop shall not exceed [_____] pascal [_____] inch wg. Filter initial efficiency shall be not less than 20 percent,
and the average efficiency shall be not less than 25 percent. Dust-holding capacity (grams per square meter
foot), at a rated air flow (cubic meter per second feet per minute) shall be not less than [_____] at [_____]
[6460 at 0.7] [10800 at [0.9] [1.2]] [600 at 1,500] [1,000 at 2,000] [1,000 at 2,500], respectively.]
[Provide Type I, Grade B filter with 40 percent commercially rated efficiency that conforms to UL 900, Class
2, and requirements specified herein. Filters, when operated at rated capacity of [_____] cubic meter per second
cfm, shall have an initial pressure drop of not more than [_____] pascal [_____] inch wg and final pressure
drop shall not exceed [_____] inch wg pascal. Filter initial efficiency shall be not less than 20 percent, and
the average efficiency shall be not less than 35 percent. Dust-holding capacity (grams per square meter foot
), at a rated air flow (cubic meter per second feet per minute) shall be not less than [_____] at [_____] [5380
at 0.7] [6460 at 0.9] [7535 at 1.2] [500 at 1,500] [600 at 2,000] [700 at 2,500], respectively.]
[Provide Type II, Grade C filter with 85 percent commercially rated efficiency [minimum of 58 percent per ASHRAE 52.1
using atmospheric dust] that conforms to UL 900, [Class 2] [Class 1] and requirements specified herein. Filters,
when operated at rated capacity of [_____] cubic meter per second [_____] cfm, shall have an initial pressure
drop of not more than[ _____] pascal [_____] inch wg, and final pressure drop shall not exceed[ _____] pascal
[_____] inch wg. Filter initial efficiency shall be not less than 58 percent, and the average efficiency shall
be not less than 76 percent. Dust-holding capacity (grams per square meter foot), at a rated air flow (cubic
meter per second feet per minute) shall be not less than [_____] at [_____] [3230 at 0.7] [4300 at 0.9] [5060
at 1.2], [300 at 1,500] [400 at 2,000] [470 at 2,500], respectively.]
[Provide Type II, Grade D filter with 95 percent commercially rated efficiency [minimum of 78 percent per ASHRAE 52.1
using atmospheric dust] that conforms to UL 900, [Class 2] [Class 1] and requirements specified herein. Filters,
when operated at rated capacity of [_____] cubic meter per second cfm, shall have an initial pressure drop of
not more than [_____] pascal [_____] inch wg, and final pressure drop shall not exceed [_____] pascal [_____]
inch wg. Filter initial efficiency shall be not less than 80 percent, and the average efficiency shall be not
less than 90 percent. Dust-holding capacity (grams per square meter foot), at a rated air flow (cubic meter
per second feet per minute) shall be not less than [_____] at [_____] [2370 at 0.7] [3230 at 0.9] [4090 at 1.2]
[220 at 1,500] [300 at 2,000] [380 at 2,500], respectively.]
[Provide Type III, Grade E filter 95 percent rated efficiency [DOP test using 0.2-micrometer particles]that conforms
to UL 900, [Class 2] [Class 1] and requirements specified herein. Filter initial pressure drop shall not exceed
[250 pascal with face velocity of 1.7 meter per second on 150 millimeter deep filter] [250 pascal with face
velocity of 2.5 meter per second on 300 millimeter deep filter] [[_____] pascal with face velocity of [_____]
on [_____] millimeter deep filter] [1.0 inch wg with face velocity of 325 fpm on 6 inch deep filter] [1.0 inch
wg with face velocity of 500 fpm on 12 inch-deep filter] [[_____] inch wg with face velocity of [_____] fpm on
[_____] inch-deep filter], and final pressure drop shall not exceed [500 pascal with face velocity of 1.7 meter
per second on 150 millimeter deep filter] [500 pascal with face velocity of 2.5 meter per second on 300 millimeter
deep filter] [[_____] pascal with face velocity of [_____] on [_____] millimeter deep filter] [2.0 inches wg
with face velocity of 325 fpm on 6 inch-deep filter] [2.0 inches wg with face velocity of 500 fpm on 12 inch-deep
filter] [[_____] inches wg with face velocity of [_____] fpm on [_____] inch deep filter]. Filter efficiency
shall be not less than 95 percent and shall be determined in accordance with MIL-STD-282, using 0.3-micrometer
particle of thermally generated DOP smoke.]
2.1.4 Filters, Automatic Type
Provide automatic renewable filtering element type filters in which a roll of the element is unwound across the
airstream by a mechanism regulated by a timer or a differential-pressure control, or a combination of both.
Provide a unit suitable for 120-volt, single-phase, 60-hertz power.
Filter performance data shall be manufacturer-established in accordance with ASHRAE 52.1 dynamic loading test
procedures. Initial resistance shall not exceed 5 pascal 0.20 inch wg at an airstream velocity of 2.5 meter
per second 500 fpm. Each filter, when operating at its specified rate of airflow, shall have a dust-holding
capacity of 700 grams per square meter 65 grams per square foot when the resistance to airflow is maintained
between 112 and 137 pascal 0.45 and 0.55 inch wg. Provide filtering element with an average dust-spot efficiency
of not less than 20 percent and an arrestance of 85 percent.
Provide a viscous-impingement progressively graded density UL, Class 2, fibrous-glass type filter. Element shall
be continuous material with a normal depth of 50 millimeter 2 inches when clean and not compress more than6 millimeter
1/4 inch when subject to air velocity of 2.5 meter per second 500 fpm. Reinforce element in both length and
width and supported so that there will be no leakage of unfiltered air. Wind dirty element with the dirty surface
inward and ensure it rerolls automatically under tension. Provide each spool of filtering element with guide
keys to ensure correct installation. Element shall have a compressibility that will allow 20 meter65 feet to
be wound to a maximum of 400 millimeter 16 inches in diameter on the used roll. Each roll of filtering element
shall be not less than 20 meter 65 feet long.
Wind and feed clean and dirty filtering element so that no blowoff of collected dirt can occur. Otherwise, contain
clean and dirty elements in steel enclosures in reverse-flow units and in horizontal units where the element
is wound outside of airstream.
Provide filter widths of uniform size for all project air-handling units.
Provide electrically driven type timer, readily adjustable in the field without special tools. Electrically
interlock timer with the fan motor to start and stop the filter element advancing mechanism, as required, when
the fan is operating. Adjust initially such that the pressure-drop through the filter element will be maintained
at approximately 112 pascal 0.45 inch wg. If used, the differential-pressure control is adjustable to any cut-in
and cutout with a differential of from 12 to 25 pascal 0.05 to 0.10 inch wg. Initially adjustment to 137 pascal
0.55 inch cut-in to 112 pascal 0.45 inch wg cutout. Install controls out of the airstream.
Equip master section with a runout switch to stop the feed movement and operate a signal light when the element
from one of the sections runs out. Furnish a manual feed-advance switch with each drive unit to advance the
element to the end of the roll as required. Locate signal light on the air-handling unit temperature-control
panel.
Fabricate filter-supporting structural members of not less than 2 millimeter14-gage mill-galvanized carbon steel
for the base and side panels and 1.6 millimeter 16-gage mill-galvanized carbon steel for the top panel. Galvanized
steel sheet shall be in accordance with ASTM A 526/A 526M.
2.1.5 Filters, High-Efficiency Particulate Air (HEPA)
Provide fire-resistant type HEPA filters capable of withstanding a minimum of 90-percent relative humidity determined
dynamically at temperatures between 21 and 38 degrees C 70 and 100 degrees F.
Filtering element shall conform to ASME AG 1. Individually certify filter to have an efficiency of not less
than 99.97 percent by test other than the DOP test specified in FED-STD-209. An acceptable method for certification
is to remove a filter from a production run prior to testing, then test the five filters before and after the
removed filter in accordance with the DOP test (99.97 percent). Successful passing of the test by the five filters
before and five filters after the untested filter shall be the acceptance criteria for the untested filter.
Clean filter static pressure drop shall not exceed 250 pascal 1.0 inch wg when the filter is tested at rated
capacity.
Filtering element shall contain no holes, cracks, slits, or other visual imperfections. Every splice required
in the assembly of a filter pack shall be joined with not less than 40 millimeter 1-1/2 inches of fire-retardant
adhesive for a continuous coating along the entire width of the element. Filter element shall be glass paper
with a minimum tensile strength of 525 newton per meter 3 pounds per inch of width and retain 50 percent of its
tensile strength when folded flat upon itself. Elongation before rupture shall be a minimum of 1 percent. Element
shall be water-proofed and shall retain 50 percent of its original tensile strength after being immersed in water.
Register legibly and indelibly on the frame of the filter unit the results of test penetration, test resistance,
test flow rate, together with direction of test airflow, manufacturer's name, model number, and serial number
of the filter unit.
Frames shall be 19 millimeter 3/4 inch plywood, Grade A-B EXT-DFPA or better, conforming to NIST PS 1. Treat
plywood to exhibit a flame-spread of not more than 30 when tested according to UL 723 or ASTM E 84. Countersink
flathead wood screws after drilling lead holes. Positive seal corner joints by coating adjoining surfaces with
a suitable adhesive having the characteristics specified below. Particle board conforming to the flame-spread
requirements specified for plywood may be used in lieu of plywood.
Coat inside face of frame members of materials entirely with an adhesive before assembly with filter pack. Following
assembly, form a continuous bead of the same adhesive to seal between cut edges of filter pack and edges of abutting
frame member on both faces of the filter unit. Filter unit shall be square to a diagonal tolerance of 3 millimeter
1/8 inch.
Provide, when cured, resilient and water-resistant adhesive able to withstand a temperature of 121 degrees C
250 degrees F for 8 hours. If capable of ignition, provide self-extinguishing adhesive which meets general
operating conditions without change in physical properties and without loss of seal. Cured adhesive shall contain
no cracks, checks, alligatoring, or separation.
HEPA filters shall be in accordance with UL 586.
[Frames shall be 2.0 millimeter 14-gage [aluminum sheet] [zinc] [aluminum] [cadmium-coated 1.6 millimeter 16-gage
steel sheet]. Corner joints shall be given a positive seal by coating adjoining surfaces with a suitable adhesive
having the characteristics indicated.]
Separators shall be constructed of [aluminum] [_____] that will not contribute to fire, will remain structurally
intact under fire exposure, and will not be damaged by exposure to the humidity and temperature.
Gasket shall be 6 millimeter 1/4 inch thick closed cellular construction neoprene or approved elastomer of 20
to 40 Shore A durometer hardness. Attach gasketing firmly and continuously to the frame with rubber-based adhesive.
Assemble filter unit to provide uniformity of materials and construction, surface smoothness and finish, cleanliness,
and freedom from protrusions and obvious flaws.
2.2 FILTER GAGES AND MANOMETERS
Provide air-filter gages or manometers for each type filter assembly.
Provide dial-indicator type gages, graduated to read 0 to 500 pascal 0 to 2 inches wg, except that gages for
HEPA filters are to read 0 to 750 pascal 0 to 3 inches wg. Manometers shall measure from minus 125 to 750 pascal
0.5 to 3 inches wg and be equipped with a built-in indicator bubble. Connect gage or manometer to static-pressure
ports of approved design and located so that resistance to airflow will be correctly indicated.
PART 3 EXECUTION
3.1 FILTER INSTALLATION
Coordinate filter supports and retention elements to provide a substantial, structurally sound, leakproof installation.
3.2 HOLDING FRAME INSTALLATION
Provide Installation drawings in accordance with referenced standards in this section.
Gasket holding frames on perimeter, or calked to each other, to supplementary steel, or to closures with elastomeric
compounds recommended by the filter manufacturer. Prepare substrate in accordance with the elastomer manufacturer's
instructions, including the priming of surfaces in areas where the elastomer is not confined.
3.3 TESTS
Submit Test reports in accordance with ASHRAE 52.1.