Permissible clearances, Limit of toxic vapors and gases – I.C.E. BMA-136 HBR User Manual

Page 11

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10

TABLE II

PERMISSIBLE CLEARNCES WITH

SPECIFIED FORMS OF PROTECTION

(Clearance in Inches)

WHERE THE REQUIRED CLEARANCE WITH NO PROTECTION IS:

36 INCHES

18 INCHES

12 INCHES

6 INCHES

TYPE OF PROTECTION

SEE NOTE

ABOVE

SIDES
REAR

ABOVE

SIDES
REAR

ABOVE

SIDES
REAR

ABOVE

SIDES

REAR

¼” asbestos millboard spaced out 1”*

30

18

15

9

9

6

3

2

28 gauge sheet metal on ¼” asbestos
millboard

24

18

12

9

9

6

3

2

28 gauge sheet metal space out 1”*

18

12

9

6

6

4

2

2

28 gauge sheet metal on 1/8” asbestos
millboard spaced out 1”*

18

12

9

6

6

4

2

2

1-½” asbestos cement covering on heating
appliance

18

12

9

6

6

4

2

1

¼” asbestos millboard on 1” rockwool batts
reinforced with wire mesh or equivalent

18

12

6

6

4

4

2

2

22 gauge sheet metal on 1” rockwool batts
reinforced with wire mesh or equivalent

18

12

4

3

2

2

2

2

¼” asbestos cement board or ¼” asbestos
millboard

36

36

36

18

12

12

4

4

¼” cellular asbestos

36

36

36

18

12

12

3

3

*Spacer shall be of non combustible material

LIMIT OF TOXIC VAPORS AND GASES

DURING NORMAL OPERATION OF THE HEATER, THE CONTENT OF TOXIC VAPORS AND
GASES IN THE TEMPERED AIR AT THE POINT OF DISCHARGE INTO THE BUILDING MUST BE
SUCH THAT NO IRRITATING EFFECTS ARE EVIDENT. THE INSTALLATION SHALL NOT BE
CONSIDERED ACCEPTABLE IF THE DISCHARGE OF TOXIC PRODUCTS IS KNOWN TO EXCEED
THE LIMITS SET OUT IN THE FOLLOWING TABLE.

SUBSTANCE PERCENT PPM

SUBSTANCE PERCENT PPM

Acetaldehyde .001 10

Formaldehyde .000025 0.25

Carbon Dioxide .250 2500

Nitrogen Dioxide .0001 1

Carbon Monoxide .001 10

Sulfur Dioxide .00005 0.5

NOTE: At 100

°F the CO

2

concentration will be in the order of 2500 P.P.M.

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