Fig. 6: Suggested method to accommodate vent connector passage through a wall composed of a combustible material.

Fig. 7: Alternate constructions that allow reduced clearances to combustible materials.

REDUCTION OF CLEARANCES WITH SPECIFIED FORMS OF PROTECTION:

Type of protection applied to and covering all surfaces of combustible material within the distance specified as the required clearance with no protection unless otherwise noted, all dimensions in inches, refer to Fig. 7.

Required clearance with no protection from the appliance or

18 inches

9 inches

6 inches

Sides &

Sides &

Sides &

chimney connector is:

 

 

Above Rear

Above Rear

Rear

a.

3-1/2" thick masonry wall without ventilation air space….

--

12

--

6

--

5

b. 1/2" insulation board over 1" glass fiber or mineral wool batts…

12

9

6

5

4

3

c. 0.024(24 gauge) sheet metal over 1" glass fiber or mineral

 

 

 

 

 

 

wool batts reinforced with wire on rear face with ventilated air

 

 

 

 

 

 

space…

9

6

5

3

3

3

d.

3- 1/2" thick masonry wall with ventilation air space..

--

6

--

6

--

6

e.

0.024 (24 gauge) sheet metal with ventilated air space.

9

6

5

3

3

2

f. 1/2" thick insulation board with ventilation air space..

9

6

5

3

3

3

g. 0.024 ( 24 gauge) sheet metal with ventilated air space over

 

 

 

 

 

 

0.024 (24 gauge) sheet metal with ventilated air space….

9

6

5

3

3

3

h. 1" glass fiber or mineral wool batts sandwiched between two

 

 

 

 

 

 

sheets 0.024 (24 gauge) sheet metal with ventilated air space

9

6

5

3

3

3

A.Equal the required clearance with no protection.

B.Equals the reduced clearance permitted in accordance with the preceding clearance chart.

C.The protection applied to the construction that covers the combustible material should extend far enough in each direction to make C equal to A.

9

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Thermo Products OD6RA072DV5B, OD6FA072DV5R, OD6RX072DV5R Reduction of Clearances with Specified Forms of Protection
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OD6FA072D48B, OD6FA072DV5B, OD6RA075DV5R, OD6FA072D48R, OD6RA072D48R specifications

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