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Combustible Header

Combustible Facing

(up to 1" (25mm) thick)

40

1

/

4

"

(1022mm)

2

1

/

2

"

(64mm)

3

1

/

2

"

(89mm)

13

3

/

4

"

(349mm)

13"

(330mm)

3

/

4

"

(19mm)

12"

(305mm)

1

3

/

16

"

(30mm)

Initial Installation

When  combustible  materials  are 

directly  above  a  90

o

  elbow,  the 

clearance  from  the  top  of  the  elbow 

is  3”  (76mm)  for  rigid  pipe  &  4  3/8” 

(111mm)  for  flex  pipe.    When  the 

elbow is above the unit, the clearance 

is 8” (203mm) above the elbow.
A shelf may be installed above the unit. 

We recommend that no heat sensitive 

items or components be placed on the 

shelf (see Figure 29).

It is not necessary to install a mantel, but if one is desired it is important to follow the guidelines.  
Top of unit to 2x4 header framing: 

0” 

(0 cm)

Top of unit to bottom of 3⁄4” (1.9 cm)-1” (2.5 cm) facing:  21⁄2”  (6.4 cm)

Top of unit to bottom of 31⁄2” (8.9 cm) mantel: 

13” 

(33.0 cm)

Top of unit to bottom of 12” (30.5 cm) mantel or ceiling:  133⁄4”  (34.9 cm)

20

3

/

4

"

(521mm)

Top of unit

Combustible

front face

Combustible board

18