General

Flanders Filters Pre Pleat 40 extended surface pleated filters are designed to operatein most every type of installation. Available in1 in., 2 in., and 4 in. nominal thickness, thesefilters have an average atmospheric dust spotefficiency range of 25-30% per ASHRAEStandard 52.1 test methods. Pre Pleat 40filters offer greater efficiency and service lifethan disposable filters, pad and framesystems, or metal washable filters. Theoverall design of this product makes thesefilters the accepted choice in applicationsrequiring high performance and extendedservice.

These filters are suitable for variable airvolume systems. Operating face velocityranges are from 0 to 500 fpm for 1 in. and 2 in.filters, and from 0 to 625 fpm for 4 in. filters.Two styles are available: Standard capacitywith 11 pleats per lineal foot and high capacitywith 15 pleats per lineal foot.

Pre Pleat 40 filters are UL 900 Class 2 listedbut are available with UL Class 1 listing.

Important Features

Radial wedge pleats minimize end losses and reduces pressure drop

Expanded metal grid prevents media flutter while in operation

Diagonal and horizontal support members provide frame strength

Filter media pack is sealed to eliminate air bypass

Average ASHRAE efficiency is 25-30%

Average arrestance is 90%-92%

Versatility

Most heating, air conditioning, or ventilating systems can be upgraded with the use of Pre Pleat 40 filters in place of existing flat panel types. The inherent strengthof the filter allows for easy changeout as it will notcollapse, warp, or bend in normal service.

Pre Pleat 40 filters are available in a wide range ofsizes and will fit most commercial and industrialinstallations with little or no system modification.Fasteners are available to adapt the filter to existingfilter banks.

Installation Considerations

Pre Pleat 40 pleated filters are suitable as primary filters and can be installed in Type 9 Holding Frames, K-Trac Framing Modules, Surepleat Side AccessHousings and similar existing hardware. They may beused as prefilters for Precision Pak, PrecisionCell andRigid-Air filters in these framing systems and inSureseal Side Access Housings.

Physical Data

Media: High-loft, non-woven cotton/synthetic blend
Media Support: Diamond-shaped expanded metal
Pleat Design: Radial wedge
Frame: Moisture-resistant carrier board

Pre40_1

Construction

Filter frames are constructed from two pieces of die-cut, moisture-resistant carrierboard. Components telescope into oneanother and provide double-wall constructionand a precision fit. The frame includesdiagonal and horizontal support membersbonded to the media on the air entering andleaving sides for unsurpassed framestrength. Locking corners and positivemedia-to-frame seal reduces the possibilityof air bypass.

The filter media is a high-loft, reinforced,non-woven cotton/synthetic blend. It iscontinuously laminated to an expandedmetal grid on the air leaving side to providepleat stability throughout the life of the filtersand prevent media flutter while in operation.

Flanders Filter's unique radialwedge pleat allows for total media usageand provides maximum air flow and dustholding capacity.

Principles Of Operation

Flanders Filter's radial wedge pleatinsures that the greatest media area is exposed tothe air flow to promote uniform dust loading.Competitive filters cannot maintain this rigidshape and tend to flatten out, using only a portionof the media.

This radial wedge creates an air exit area (B) equal to the air entering area (A), which minimizesend losses and reduces pressure drop.

Non-radial wedge pleats have unequal air exit (D)and air entering (C) areas, which cause higherresistance and uneven use of media.

Performance Data

Capacities And Dimensions

Nominal
Depth
(in.)

Nominal Size
H x W x D
(in.)

Standard Capacity

High Capacity

300 fpm

500 fpm

Media
Area
(sq. ft)

Weight
Each
(lbs.)

300 fpm

500 fpm

Media
Area
(sq. ft)

Weight
Each
(lbs.)

cfm

10 x 10 x 1

210

.15

347

.35

1.1

210

.13

347

.33

1.6

10 x 20 x 1

417

.15

694

.35

2.2

417

.13

694

.33

3.2

12 x 20 x 1

500

.15

833

.35

2.7

500

.13

833

.33

3.8

12 x 24 x 1

600

.15

1000

.35

3.5

600

.13

1000

.33

4.5

14 x 20 x 1

583

.15

972

.35

3.1

583

.13

972

.33

4.5

14 x 25 x 1

729

.15

1215

.35

4.0

729

.13

1215

.33

5.3

15 x 20 x 1

625

.15

1042

.35

3.3

625

.13

1042

.33

4.8

16 x 20 x 1

667

.15

1110

.35

3.6

667

.13

1110

.33

4.8

16 x 25 x 1

834

.15

1390

.35

4.6

834

.13

1390

.33

6.1

20 x 20 x 1

834

.15

1390

.35

4.6

834

.13

1390

.33

6.1

18 x 24 x 1

900

.15

1500

.35

4.8

900

.13

1500

.33

6.9

18 x 25 x 1

945

.15

1575

.35

5.0

945

.13

1575

.33

7.2

20 x 24 x 1

1000

.15

1667

.35

5.3

1000

.13

1667

.33

7.7

1.0

20 x 25 x 1

1042

.15

1735

.35

5.5

1042

.13

1735

.33

7.6

1.0

24 x 24 x 1

1200

.15

2000

.35

6.4

1200

.13

2000

.33

8.9

1.1

10 x 20 x 2

417

.12

694

.27

4.5

417

.11

694

.25

6.4

12 x 20 x 2

500

.12

833

.27

5.3

500

.11

833

.25

7.7

12 x 24 x 2

600

.12

1000

.27

5.8

600

.11

1000

.25

8.7

1.0

14 x 20 x 2

583

.12

972

.27

6.2

583

.11

972

.25

8.9

1.0

14 x 25 x 2

729

.12

1215

.27

7.8

1.0

729

.11

1215

.25

11.2

1.2

15 x 20 x 2

625

.12

1042

.27

6.7

625

.11

1042

.25

9.6

1.0

16 x 20 x 2

667

.12

1110

.27

6.6

667

.11

1110

.25

10.0

1.1

16 x 25 x 2

834

.12

1390

.27

8.3

1.1

834

.11

1390

.25

12.4

1.3

18 x 24 x 2

900

.12

1500

.27

9.6

1.2

900

.11

1500

.25

13.8

1.5

18 x 25 x 2

938

.12

1563

.27

10.0

1.3

938

.11

1563

.25

14.4

1.6

20 x 20 x 2

834

.12

1390

.27

8.3

1.1

834

.11

1390

.25

12.4

1.3

20 x 24 x 2

1000

.12

1667

.27

10.7

1.3

1000

.11

1667

.25

15.3

1.6

20 x 25 x 2

1042

.12

1735

.27

10.3

1.3

1042

.11

1735

.25

15.5

1.6

24 x 24 x 2

1200

.12

2000

.27

12.3

1.5

1200

.11

2000

.25

17.8

1.8

25 x 25 x 2

1300

.12

2170

.27

13.3

1.6

1300

.11

2170

.25

19.2

1.9

12 x 24 x 4

600

.10

1250

.30

11.6

1.5

600

.09

1250

.28

14.0

1.7

16 x 20 x 4

667

.10

1390

.30

11.8

1.7

667

.09

1390

.28

15.5

1.8

16 x 25 x 4

834

.10

1735

.30

15.0

2.0

834

.09

1735

.28

19.6

2.2

18 x 24 x 4

900

.10

1500

.30

17.4

2.1

900

.09

1500

.28

21.9

2.3

20 x 20 x 4

834

.10

1735

.30

15.0

2.0

834

.09

1735

.28

19.6

2.2

20 x 24 x 4

1000

.10

1667

.30

19.3

2.3

1000

.09

1667

.28

24.3

2.5

20 x 25 x 4

1042

.10

2170

.30

20.2

2.3

1042

.09

2170

.28

24.0

2.5

24 x 24 x 4

1200

.10

2500

.30

22.3

2.5

1200

.09

2500

.28

28.0

3.0

25 x 29 x 4

1500

.10

3100

.30

27.2

3.1

1500

.09

3100

.28

34.0

3.6

28 x 30 x 4

1680

.10

3500

.30

31.3

3.5

1680

.09

3500

.28

39.0

4.2

Notes:

1. PD represents clean pressure drop in inches w.g. The recommended final pressure drop for all models is 1.0 in. w.g. System design may dictate a lower change-out point.

2. Actual filter face size for 12 x 24 and 24 x 24 filters is 5/8 in. under on height and width. Actual face size on all other sizes is 1/2 in. under on height and width.

3. Actual filter depth is 1/8 in.under for all nominal 1 in. deep filters. Actual filter depth is 1/4 in. under for all nominal 2 in. and 4 in. deep fiters.

4. For capacities other than those shown, ratio the face velocities.

5. Performance tolerances conform to Section 7.4 of ARI Standard 850.

Pre Pleat Class 1 air filters aredesigned for applicationswhere a UL Class 1 fire ratedfilter is required and metalframes are unsuitable.

Pre Pleat HT air filters aredesigned for applicationswhere the temperaturesreach up to 500 oF.

62R high efficiency pleated airfilters contain an electostaticallycharged filtration media whichhas a higher dust holdingcapacity.

Pre Pleat HV air filters aredesigned to operate inhigh velocity and turbulentair applications wherestandard pleated filterstend to fail.

Guide Specifications

1.0	General
1.1	Medium efficiency filters shall be Pre Pleat 40extended surface pleated filters as manufactured by Flanders Filters.
1.2	Filter sizes and capacities shall be as scheduled on the drawings.
1.3	Filters shall be UL 900 Class 1 or 2 listed. locking corners.
2.0	Filter Construction
2.1	Filters shall be constructed of reinforced, nonwoven cotton/synthetic blend media laminated to an expanded metal grid on the air leaving side and formed into radial wedge pleats.
2.2	Frame shall be moisture-resistant carrier board with diagonal and horizontal support members on the

	shall be 25-30% as determined by ASHRAE Standard 52.1 test methods. upstream and downstream sides, and shall have locking corners.
3.0	Performance
3.1	Initial and final resistances shall not exceed the scheduled values.
3.2	Media area must equal or exceed that of the specified filter.
3.3	The average atmospheric dust spot efficiency shall be 25-30% as determined by ASHRAE Standard 52.1 test methods.
3.4	The manufacturer shall guarantee performance as stated in the literature within tolerances as outlined in Section 7.4 of ARI Standard 850.

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