P.1 

OAR Box 1814 

Prepped by Ollie Stewart 

Document Number: 

37) ll-B-15 

Docket Number: 

A-88-02 

Printed 11/7/2008 7:22:07AM Sheet 37 of 63 
P.2 

( ^ 

A-88-02 

•ft-\S 

MIDWEST RESEARCH INSTITUT 

4505 Creeamc 

Raietgn N C 2:6 

Telephone (919) 781 

Date: December 9, 1986 

(Finalized February 27t 1987) 

Subject: Site Visit—Duall Industries 

Chromium Electroplating NESHAP 

EPA Contract 68-02-3817; ESED Project 85/02a 

MRI Project 7717-K 

From: 

To: 

Robin Barker 

Al Vervaert 

ESED/ISB/SSS (MO-13) 

U. S. Environmental Protection Agency 

Research Triangle Park, N.C. 27711 * 

I. Purpose 

The purpose of this visit was to gather background information about 

mist eliminators manufactured by Duall Industries for controlling 

emissions of chromic ad d mist from chromium electroplating baths. 

II. Place and Date 

Duall Industries 

102 Hillside Drive 

Forest City, North Carolina 28043 

(704) 245-8725 

November 10, 1986 

III. Attendees 

Duall Industries 

Larry Hartley, Production Supervisor 

U. S. Environmental Protection Agency (EPA) 

Al Vervaert, ISB 

Midwest Research Institute (MRI) 

Robin Barker 

Randy Strait 

/• 
P.3 

IV. Discussion 

The visit began at 1:30 p.m. with a discussion about the basic 

design of mist eliminators. This was followed by a tour of the plant. 

A. General 

Duall Industries (Duall) manufactures Industrial ventilation and air 

pollution control systems. The systems typically are made of polyvinyl 

chloride (PVC), polypropylene, or other corrosion-resistant materials. 

Duall manufactures both packed-bed scrubbers and mist eliminators to 

control chromic acid emissions from electroplating tanks. Duall 

recommends packed-bed scrubbers rather than mist eliminators for 

controlling chromic acid mist because they achieve higher removal 

efficiencies and are easier to maintain. Information brochures for Duall 

mist eliminators and scrubbers are presented in the attachment to this 

report. 

B. Control Device Information 

1. Chevron-blade mist eliminators. The mist eliminator 

manufactured by Duall contains a single set of vertically mounted, 

chevron-type PVC eliminator blades. A schematic of the overlapplng-type 

blade design used by Duall is shown in Figure 1. These blades provide 

four 30-degree air direction changes. Droplets of chromic ad d carried by 

the exhaust gas impinge on the blades and drain to the bottom of the 

unit. Each blade is 20.32 centimeters (cm) (8 inches [in.]) long, and the 

blades are spaced 3.18 cm (1.25 in.) apart. The blades are manufactured 

by Murphy Plastics of Rosevilie, Michigan, and are assembled Into the mist 

eliminator unit in Duall's Forest City facility. The unit 1s equipped 

with a washdown spray system for cleaning the blades. 

2. Packed-bed scrubbers. Duall manufactures single and double 

packed-bed scrubbers for controlling chromic acid mist. The packed-bed is 

30.48 cm (12 in.) deep and contains loose propropyiene packing media. 

Both Jaeger Tri-packs and Glitsch ballast rings are used as packing media. 

C. Candidate Plants 

Mr. Hartley suggested Accurate Plating 1n Gaffney, South Carolina, 

as a possible test candidate. A Duall mist eliminator and moisture 

extractor will be installed at the facility to control chromic ad d mist 

from a hard chromium electroplating tank after construction of the 

facility has been completed. 

Attachment 
Figure 1. Overlapping-type blade design. 

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SViiET YOUR 

POLLUTSOI 

CONTROL 

REQUIREMENTS 

WDTH THE LEADER IN 

LLU FABRICATIONS 

P V C CONSTRUCTED 

FUME SCRUBBERS 

CENTRIFUGAL FANS 

DUCTING sold HOODS 

OIL fVSDST COLLECTORS 

COMPLETE SYSTEMS 

AZL-JL ^5 . 

INDUSTRIES , IMC . 

'00 S McMillan Street . Owosso. MichiRan 

Phone <5W) /?b-H 184 . Telex 728-532 

P.O. Box 1000 « 102 Hillside Drive 

Koiest City, N.C. ?fl043 • UM) 245-S725 

4 
P.6 

T)ua£e Fume Scrubbers in 6 Types 

F-101 SERIES 

Smgle 

Pack 

Double 

Pack 

FW-300 SERIES 

Single 

Pack 

Double . 

Pack 

\ 2 

Duall Single Pack (four Stage) Fume Scrubbers solve most 

industrial air pollution problems. They are especially effective 

on water soluble fumes and odors, or with pH control on many 

low soluble contaminants. 

Some typical proven applications are: 

Acid fumes. 

Plating fumes. 

Cleaning fumes. 

Lab hood fumes. 

Anodizing fumes. 

Pickling fumes. 

Rust-proofing fumes. 

Die-casting fumes. 

Water soluble odors. 

Duall Single Pack Fume Scrubbers incorporate -hese 

advantages: 

Low cost. 

Low maintenance. 

Low water consumption. 

Low static pressure drop. 

100% corrosion resistant. 

Duall Double Pack (six stage) Fume Scrubbers offer the broadest 

range of answers to industrial air pollution problems. By double 

scrubbing the air these scrubbers provide maximum efficiency 

on tough fumes and odors which can not be completely absorbed 

in a single pack type scrubber. 

Duall's Double Pack Scrubbers have proven effective on the 

following typical applications: 

Bright dip fumes. 

Strip tank fumes. 

Etching fumes. 

Most low solubility fumes and odors. 

Our Double Pack Fume Scrubbers offer all the advantages of the 

Single Pack units as well as the broadest range of applications. 

All Duall Fume Scrubbers can be modified for custom installation 

with multiple packs or extended depth packs. Multiple modula 

units are available for capacities larger than standard. 

See page 6 for complete specs and performance data. 

PT-500 SERIES 

Single 

Pack 

Double 

Pack 

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F-101 HORIZONTAL SINGLE FILTER PACK 

Being our most popular scrubber design, this compact 100% corrosion resistant P.V.C. unit has proven its efficiency nationwide. 

The Duall F-101 incorporates high efficiency, low maintenance filter 

media and the open orifice type spray nozzles, for the assurance of 

a thoroughly saturated collection chamber. Our mist eliminator 

outlet section gives four air direction changes to properly remove 

the entrained moisture. Where a horizontal installation is preferred, 

the F-101 should be your choice. 

CFM 

000 • 

0.S 

1 

2 

3 

4 

S 

6 

8 

10 

12 

14 

16 

18 

DIMENSIONS IN INCHES 

A 

IB 

22 

28 

32 

37 

41 

45 

52 

58 

64 

69 

74 

81 

B 

10 

14 

20 

24 

29 

33 

37 

44 

46 

52 

57 

62 

65 

c 

10 

14 

20 

24 

29 

33 

37 

44 

46 

52 

57 

62 

69 

D 

49 

SO 

50 

51 

52 

52 

S3 

54 

59 

60 

60 

61 

61 

E 

30 

34 

40 

44 

49 

S3 

58 

65 

71 

77 

82 

87 

91 

H 

10 

14 

70 

24 

29 

33 

37 

44 

46 

52 

57 

62 

65 

1 

10 

14 

20 

24 

29 

33 

37 

44 

46 

52 

57 

62 

69 

0 

37 

38 

38 

39 

40 

40 

41 

47 

43 

44 

44 

45 

45 

4 

21 

23 

26 

28 

30VJ 

32'/! 

35V, 

39 

42 

45 

47V, 

50 

52"; 

CFM 

000! 

20 

22 

24 

26 

28 

30 

35 

40 

45 

50 

55 

60 

» 

A 

88 

97 

104 

112 

123 

135 

157 

179 

102 

224 

747 

269 

B 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

c 

72 

81 

88 

96 

107 

119 

141 

163 

186 

208 

231 

253 

O 

66 

66 

66 

66 

66 

66 

66 

66 

66 

66 

66 

66 

E 

87 

87 

87 

87 

87 

87 

87 

87 

87 

87 

87 

87 

larger li m on *«*-u«t. 

H 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

1 

72 

81 

88 

96 

107 

119 

141 

163 

186 

208 

211 

253 

0 

46 

46 

46 

46 

46 

46 

46 

46 

46 

46 

46 

46 

< 

52V-

.7*1, 

S2V, 

52Vi 

S7VS2V, 

52V, 

SJ'/i 

52VS2V, 

S2Vi 

52Vi 

F-1 0 1 D HORIZONTAL DOUBLE FILTER PACK 

An extra heavy duty scrubber for real "tuffies'7 It incorporates two 

filter packs with rwo sets of sprays for more thorough scrubbing . . . 

plus an effective mist eliminator at the air outlet. Serious concentrations of rough fumes, such as nitric, hydrofluoric, and hydrochloric 

acid are double scrubbed through six stages for maximum efficiency. 

Use this high efficiency fume scrubber, at only a small increase 

in price. 

CFM 

000* 

0.5 

1 

2 

3 

4 

5 

6 

8 

10 

12 

14 

16 

18 

DIMENSIONS IN INCHES 

A 

18 

22 

28 

37 

37 

41 

45 

52 

58 

64 

69 

74 

81 

B 

10 

14 

20 

24 

29 

33 

37 

44 

46 

52 

57 

62 

65 

C 

10 

14 

20 

24 

29 

33 

37 

44 

46 

52 

57 

62 

69 

O 

70 

71 

71 

72 

73 

73 

74 

75 

80 

81 

81 

82 

82 

E 

30 

34 

40 

44 

49 

S3 

58 

65 

71 

77 

82 

87 

91 

H 

10 

14 

70 

24 

29 

33 

37 

44 

46 

52 

57 

62 

65 

1 

10 

14 

20 

24 

29 

33 

37 

44 

46 

52 

57 

62 

69 

0 

sa 

59 

59 

60 

61 

61 

62 

63 

64 

65 

65 

66 

66 

. 

21 

23 

26 

28 

30V. 

32V, 

3SV39 

42 

45 

47", 

50 

52 V, 

CFM 

0001 

20 

22 

24 

26 

28 

30 

35 

40 

45 

50 

55 

60 

» 

A 

88 

97 

104 

112 

123 

135 

157 

179 

202 

224 

247 

269 

B 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

C O 

72 87 

81 87 

88 87 

96 87 

107 87 

119 87 

141 87 

163 87 

186 87 

208 87 

231 87 

2S3 87 

lar-)tfsitMonr«|i 

E 

91 

91 

91 

91 

91 

91 

91 

91 

91 

91 

91 

91 

mt. 

H 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

61 

1 

72 

81 

88 

96 

107 

119 

141 

163 

186 

208 

231 

253 

O 

67 

67 

67 

67 

67 

67 

67 

67 

67 

67 

67 

67 

. 

52V, 

52 V, 

52 V, 

52 V, 

52V, 

52 V, 

52 V, 

52V, 

52 V, 

52 V, 

52 V, 

52 V, 

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FW-300 AND FW-300D VERTICAL 

SINGLE AND DOUBLE FILTER PACKS, 

WITH MOTOR BLOWER 

The packed tower type scrubber is not only a space saver, it s also 

a true economy model. It incorporates a built-in rugged fan with 

convenient exterior, belt driven. TEFCBB motor. During installation, 

the horizontal air discharge can be swivelled 360: before sealing into 

permanent position. Efficiency is equal to the F-101 and the PT-500. 

Compactness and versatility make it an unusually popular model 

FW-300 saves three ways ... in initial cost, installation, and in space. 

For double pack model, specifications are also shown below. 

• For general information see page 2. 

FW-300 SINGLE PACK SPECIFICATIONS 

UM 

in 

0001 

as 

i 

2 

3 

4 

5 

6 

7 

8 

10 

12 

Fan 

N*. 

6 

8 

10 

30 

33 

36V, 

44V, 

•4V, 

49 

49 

54 

MMW 

V4 

l

1

', 

7", 

7V, 

7", 

10 

15 

15 

BMP 

61 

122 

2.59 

2 72 

363 

4 85 

587 

6.20 

-7 35 

9 56 

12.77 

ST. 

m 

lnch*n 

DIMENSIONS IN INCHES 

A 8 C O E 

90V, 

95 

98V, 

103 

103 

103 

104 

104 

106 

106 

II6V, 

20 

26 

37 

34 

40 

45 

49 

S3 

57 

64 

70 

4 

6 

8 

10 

10 

11 

11 

12 

12 

14 

16 

6V< 

9 

12 

ISVi 

17 V. 

19 

23V. 

23V4 

25V, 

7SV, 

28V, 

4V, 

S'/i 

7V, 

11'/4 

13 V. 

14 V, 

17 V. 

17 V. 

19V, 

19 V, 

71V, 

F 

14 

14 

14 

14 

14 

14 

14 

14 

16 

16 

20 

O 

8 

1? 

16 

20 

76 

30 

36 

44 

44 

48 

48 

Y 

9 

10 

10 

10 

10 

15 

IS 

15 

15 

IS 

IS 

z 

18 

20 

20 

?! 

21 

25 

25 

25 

25 

25 

26 

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FW-300 D DOUBLE PACK SPECIFICATIONS 

CFM 

in 

000s 

0.5 

1 

2 

3 

4 

5 

6 

7 

8 

10 

12 

Fan 

No. 

6 

8 

10 

30 

33 

36V, 

44V, 

44V, 

49 

49 

54 

Motor 

Hp. 

1 

2 

5 

5 

5 

7V, 

7V, 

10 

10 

15 

20 

S.P. 

Inthe-i 

DIMENSIONS IN INCHES 

A B C O 

114V, 20 4 6V4 

119 26 6 9 

122V, 32 8 12 

127. 34 10 15". 

127 40 10 17", 

127 45 11 19 

128 49 11 23V. 

129 53 12 23'/4 

131 57 12 25Vi 

133 64 14 2SV, 

143V, 70 16 28VJ 

E 

4V, 

5 V, 

7". 

IP/4 

13 V. 

14V, 

17", 

17 V, 

19 V, 

19 V, 

21V, 

O 

8 

12 

16 

20 

26 

30 

36 

44 

44 

48 

48 

Y 

9 

10 

10 

10 

10 

15 

IS 

15 

15 

IS 

IS 

z 

18 

20 

20 

21 

21 

25 

2S 

25 

25 

25 

76 

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PT-500 AND PT-500D VERTICAL 

SINGLE AND DOUBLE PACK 

The upright PT-500 is the space saver. This scrubber is a vertical 

packed tower type designed to fit into restricted spaces where floor 

space is at a premium. Its efficiency is equal to the F-101, and also 

100% corrosion-free. Air flow is up through a thoroughly water 

saturated bed of filter media. The mist eliminator pack near the top 

outlet assures properly dried air. If space is your problem, take a good 

look at the PT-500. For double pack models, specifications are 

also shown below. 

• For general information see page 2. 

PT-50 0 SINGLE PACK SPECIFICATIONS 

'•» »!•» 

Q 

CFM 

in 

000s 

0.S 

1 

2 

3 

4 

5 

6 

B 

DIMENSIONS IN INCHES 

A B COFGHR S 

14 8 4 8 14 13 

20 10 6 12 20 13 

28 14 8 16 28 13 

34 16 10 70 34 13 

40 20 10 26 40 13 

44 24 11 30 44 13 

48 28 11 36 48 13 ' 

56 36 12 44 56 13 

' 12 18 

! 12 19 

! 12 20 

. 12 21 

f 12 21 

? 12 21V, 

12 21V, 

1 12 22 

CFM 

in 

000s 

10 

12 

14 

16 

18 

20 

22 

24 

A 

62 

68 

74 

80 

84 

88 

92 

96 

B 

42 

48 

54 

60 

64 

68 

72 

76 

C 

14 

14 

15 

16 

17 

18 

18 

18 

O 

48 

48 

52 

56 

60 

64 

68 

72 

F Q 

62 13 

68 13 

74 13 

80 13 

84 13 

88 13 

97 16 

96 16 

H R 

3 12 

3 18 

3 18 

3 18 

4 18 

4 18 

4 18 

4 18 

S 

23 

23 

23V, 

24 

24V, 

25 

25 

25 

»Larger sues on request. 

PT-500 D DOUBLE PACK SPECIFICATIONS 

CFM 

in 

000s 

0.5 

1 

2 

7 

4 

5 

6 

8 

DIMENSIONS IN INCHES 

A B COFGHR S 

14 8 4 8 14 13 

20 10 6 12 20 13 

28 14 8 16 28 13 

34 16 10 20 34 13 

40 20 10 26 40 13 

44 74 11 30 44 13 

48 28 11 36 48 13 

56 36 1? 44 56 13 

12 18 

! 12 19 

! 12 20 

' 12 21 

? 12 21 

12 21V, 

t 12 21V, 

I 12 22 

CFM 

in 

000s 

10 

12 

14 

16 

18 

20 

22 

24 

A 

62 

68 

74 

80 

84 

88 

92 

96 

B 

42 

48 

54 

60 

64 

68 

72 

76 

C 

14 

14 

15 

16 

17 

18 

18 

18 

D 

48 

48 

52 

56 

60 

64 

68 

72 

F G 

62 13 

68 13 

74 13 

SO 13 

84 13 

88 13 

92 16 

96 16 

H R S 

3 12 23 

3 18 23 

3 18 23 V, 

3 18 24 

4 18 24 Vt 

4 18 25 

4 IB 25 

4 18 25 

»larger sizes on re-pml. 

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*DltfUt*\MW SCRUBBERS 

SPECIFICATIONS and 

PERFORMANCE DATA 

DESCRIPTIONS 

F-101. Horizontal (cross-flow), four stage, wet scrubber. This 

model has maximum efficiency on water soluble contaminants and odors, but is also effective on low soluble contaminants with the use of chemical neutralizers. 

F-101O. Horizontal (cross-flow), six stage, wet scrubber. The 

F-101O is especially designed for use on stubborn low 

solubility contaminants or where extremely high scrubbing 

efficiency is required on normal contaminants. 

FW-300. Vertical (counter-flow), four stage, wet scrubber with 

integral blower. Efticency is equal to the F-101. 

FW-300O. Vertical (counter-flow), six stage, wet scrubber with 

integral blower. Efficiency is equal to the F-101D. 

PT-500. Vertical (counter-flow), four stage, wet scrubber. 

Efficiency is equal to the F-101. 

PT-5000. Vertical (counter-flow), six stage, wet scrubber. 

Efficiency is equal to the F-1010. 

All Duall Fume Scrubbers are constructed of PVC. and 

Polypropylene corrosion resistant materials and include a 

rugged coated steel base with lifting luggs. All above units 

are available with extended depth packing. 

SCRUBBING PRINCIPLES 

Contaminant removal is accomplished by first slowing the 

fumes to a velocity below SOO fpm and then passing the fumes 

through two scrubbing stages in the single pack models and 

four stages in the double pack types. The fumes first pass 

through a water spray or curtain during which a percentage 

of the larger contaminant particles drop out and the remaining 

fumes are saturated. The second stage consists of a 12" deep 

pack of polypropylene high surface, non-clogging, spherical 

plate packing media' which is continuously wetted by the 

spray nozzles. The saturated fumes are impinged upon the 

packing and the contaminants are absorbed and earned away 

in the wash water. The first and second stages are repeated 

in the double pack fume scrubbers. 

'Several types of alternate packing media are available on 

request. 

MIST ELIMINATION 

After passing through the scrubbing sections, the air is 

moisture laden and must pass through a two stage gravity mist 

eliminator section. This final stage of PVC. eliminator blades 

provides four 30° changes in direction and eliminates entrained water. 

WATER SUPPLY 

All Duall Fume Scrubbers may be supplied with water either 

directly from your supply or from an integral or remote recirculation system supplied with the scrubber. It is generally 

recommended that a recirculation system be used to conserve 

water except on very low cfm units. The actual fresh water 

consumption on the single pack series with recirculation is 

only 0.05 to 0.15 gpm/1000 cfm depending on the contaminant 

involved. On the double pack models, water consumption 

ranges from 0.1 to 0.3 gpm/1000 cfm. This represents 5% of 

the water being recirculated. Duall scrubbers are self-draining 

and may be installed out-doors in sub-zero conditons without 

freeze-up. If these conditions exsist. a remote recirculation 

system should be specified for placement in a heated area. 

All Duall Scrubbers come complete with fittings for the additon 

of chemical neutralizers. if required. A complete chemical 

metering and pumping system is available upon request. 

MATERIALS 

Every Duall Fume Scrubber is shipped complete with an 

integral coated steel base. No special mounting is required. 

Simply connect the duct, the water and power supply, and 

the unit is ready for operation. Complete installation and 

operating instructions are supplied with all Ouall Scrubbers. 

PRESSURE DROP 

The following pressure drops are applicable for Scrubbers 

operated at design CFM: 

F-101 2.0"w.g. FW-300D 3.0"w.g. 

F-101O 3.0" w.g. PT-500 2.0" w.g. 

FW-300 2.0" w.g. PT-500D 3.0" w.g. 

On the FW-300 series, the blower is designed for 2.0" external 

static pressure. 

FW-300 BLOWER SECTION 

The top section of the FW-300 Fume Scrubber consists ot a 

Duall PVC. centrifugal blower complete with motor and OSHA 

oeit guard and shaft cover The Olower section may De rotated 

through 360s to obtain any desired angle between scrurjoer 

miet and blower outlet. This blower section is same i0w 

maintenance, guaranteed corrosion resistant blower described 

m Duall Brochure No CI-131. and NH-151. 

MAINTENANCE 

All Duall Fume Scrubbers incorporate low maintenance components from front to back, including the pacKing. olumDinn 

system and eliminators. Quick opening inspection doors are 

at all critical points. 

^ 

DUALL FUME SCRUBBERS 

Typical Average Fume Removal Efficiencies 

MODELS* 

CONTAMINATES 

• 

Acetic Acid 

Alkaline Cleaners 

Single 

Pack 

Series 

F-101 

PT-500 

FW-300 

1 

Aluminum Bright Dip * 

Anodizing 

Aqua Regia 

Boric Acid 

Caustic Cleaners 

Caustic Soda 

Chlorine 

Chromic Acid 

Copper Chloride 

Cyanide Solutions 

Ferric Chloride 

Ferric Nitrate 

Ferrous Chloride 

Ferrous Sulfate 

FluOSiliCiC Acid 

Hydrochloric Acid 

Hydrogen Cyanide 

Hydrofluoric Acid 

HydrofluosiliCiC Acid 

Hydrogen Peroxide 

Hydrogen Sulfide 

Nickel Chloride 

Nickel Sulfate 

Nitric Acid 

Nitrogen Dioxide (NOz) 

Nitric — HF Acid 

Perchloric Acid 

Phosphoric Acid 

Potassium Dichromate 

Selenium Sulfide 

Sodium Chloride 

Sodium Fluoride 

Sodium Qlutenate 

Sodium Hydroxide 

Sulfur Dioxide 

Sulfuric Acid 

Tin Chlorides 

Zinc Chloride 

Zinc Nitrate 

Zinc Sulfate 

Double 

Pack 

Series: 

F-1010 

PT-5000 

FW-3000 

1 

95-98 

96-99 

80-85 

96-99 

80-85 

85-90 

98-99 

98-99 

80-85 

-33-99") 

75-TO 

98-99 

80-85 

96-98 

90-95 

95-97 

95-98 

80-85 

85-90 

90-93 

95-98 

90-95 

70-75 

30-85 

80-35 

75-80 

45-50 

75-30 

95-98 

96-99 

96-98 

96-98 

96-98 

90-95 

96-98 

98-99 

70-75 

96-98 

75-80 

75-80 

96-98 

96-98 

S ngle 

Pack 

Series.-

OouDie 

Pack 

Series. 

with added 

Chemical Neutralizer 

1 

98-99 

98-99 

85-90 

98-99 

85-90 

90-95 

99 

99 

85-90 

•.as*' 

80-85 

99 

83-88 

98-99 

95-98 

96-98 

98-99 

85-90 

90-95 

95-98 

98-99 

95-99 

75-80 

85-90 

85-90 

85-90 

50*60 

85-90 

96-99 

98-99 

98-99 

98-99 

98-99 

95-98 

98-99 

99 

75-80 

98-99 

80-85 

80-85 

98-99 

98-99 

(pH Control) 

— 

— 

— 

1 

— 

— 

85-90 90-95 

— 

— 

— — 

85-90 90-95 

— 

85-9C 

— 

— 

— 

— 

— 

— 

90-9! 

— 

— 

— 

— 

85-9C 

90*9! 

90-9! 

— 

— 

) 90-95 

— 

— 

— 

— 

— 

— 

95-98 

— 

— 

— 

— 

) 95*98 

95*98 

> 95*98 

— 

65*70 70-75 

— 

— 

— 

— 

— 

— 

— 

— 

— 

80-85 

— 

85-9C 

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 

35*90 

— 

) 90-95 

— 

— 

) 

* These efficiencies are tor thecomdined nitric and phosphoric 

fume. The efficiency tor the NOj portion of the fume only 

will be as listed above. 

• The above efficiencies are intended as guide representing 

average values. Specific combinations and concentrations 

of fumes may result m a significant variation from the above. 
P.11 

Witt Dm Sfnrlliif 

-AMoisture Extractor 

The Duall Moisture Extractor is effective on entrained water and other 

relatively heavy, airborne particles. Moisture removal is accomplished centrifugally as the air passes through a set of stationary 

blades. At design air flow a 0.75" static pressure drop is required. 

The Duall Moisture Extractor is constructed of PVC and is complete 

with a drain coupling and spray system for periodic wash down. 

This unit is designed for installation in a vertical run of duct. 

A 

B 

F 

DIMENSIONS IN INCHES 

8 10 12 14 16 

14 16 20 22 24 

29 

11 

28 

20 22 

30 32 

34 

24 

34 

26 

36 

28 30 

38 41 

40 

32 

46 

34 

41 

36 38 

52 54 

46 

40 

57 

42 

60 

44 46 

63 66 

52 

48 

69 

54 60 

76 86 

56 

Chemical Mist Eliminator 

Duall's Chemical Mist Eliminator was developed for use on moisture 

laden fumes containing dissolved chemicals such as chrome, sulfuric 

acid, copper, zinc. etc. Contaminant removal takes place in a set of 

vertically mounted, chevron type, PVC eliminator blades. These 

blades provide four 30° direction changes resulting in high removal 

efficiency. A wash down spray system, drain and plastisol coated 

steel base frame are included as standard equipment. 

This unit may be equipped with an inlet spray system for use as 

a fume washer. 

The Duall Chemical Mist Eliminator is designed for installation 

in a horizontal configuration. 

S»ri| N«zt« fir Witi 

h 28*-

CFM(000's)> 

A 

OVERAU 

WIDTH 

c 

DIMENSIONS IN INCHES 

.05 1 2 3 4 5 6 8 10 12 14 16 18 20 22 24 26 28 30 35 40 45 50 

9 13 11 22 26 29 32 36 40 44 48 50 55 58 60 65 68 70 75 78 85 88 92 

12 16 21 25 29 32 36 40 44 48 52 54 59 62 64 69 72 74 79 82 89 92 96 

20'/, 24|/, 29'/, 33'/, 37'/, 40'/, 43'/, 47'/, 51'/, 55'/, 59'/, 61'/, 66'/, 69'/, 71'/, 76'/, 79'/, 81'/, 86'/, 89'/, 96'/, 99'/, 103'/-, 

OPTIONAL pH CONTROL PACKAGE 

An optional pH control system is available for use with 

any new or existing Duall Fume Scrubbers. pH control 

will allow precise control over effluent quality as 

well as provide neutralization for contaminants in the 

fume scrubber. 

The pH control package includes a pH probe and transmitter, a pH analyzer and pump control, and a variable 

output chemical pump. 

/cO 
P.12 

EXPERIENCE IN THE INDUSTRY 

INOUSTR.IS MEAN S DEPENDABLE SERVICE FOR YOU ! 

• CENTRIFUGAL FANS 

• FUME WASHERS 

e MOISTURE EXTRACTORS 

• HOODS 

• DUCT 

• FITTINGS 

• SEMI-ENCLOSED LAB 

VENTILATION CONSOLES 

• CLEANIN6/PLATING CONSOLES 

• GRILLES 

• MIST EUMINATORS 

• STACK CAPS 

• MATERIALS HANOUNG DUCT 

• TANKS ANO TANK LINERS 

and all types of special fabrications 

such as.. . 

• PLATING RACKS ANO BASKETS 

• TANK GUARDS 

• CURRENT BLOCKS 

• ELECTRICAL INSULATORS 

• ABRASION-RESISTANT SHIELDS 

• SPRAY BOOTH SHIELDS 

• PROTECTIVE WALL COVERINGS 

• MACHINED PARTS 

plus these other stock items: 

PVC sheet rod. pipe, nuts, bolts 

and fittings 

• POLYPROPYLENE 

• POLYETHYLENE 

T>tudt INDUSTRIE S IN I 

T-.I.*- 2?S!>37 

ODOR CONTROL SYSTEMS 

122 e *••"• 

Pt-1-tWd IR U.SJL 

/'