Martin Fireplaces 400BWBCIA, 400BWBIA, 400BWBA, 400BWBCA Dropping Plum Line From Ceiling

CHIMNEY INSTALLATION

LOCATING CENTER LINE

You will need to lay out, cut and frame openings through all ceilings and the roof at the point where the chimney will pass through.

Place fireplace in planned position for installation. Unless the chimney is to be offset, the point where the center line of the chimney will pass through the ceiling and roof can be determined with a plumb line. See Figure 16. Drive a nail in the center point.

Note: Make sure the chimney location is well away from ceiling and roof joists and/or anything else that might be in the way.

Drive a long nail through the roof from underneath to mark the roof opening center line. Make sure the nail is long en ought to go through the roof and be seen on the rooftop. If the chimney is to penetrate a pitched roof, the hole in the roof must be rectangular instead of square and should be sized according to Table 1.

Center Line

to Chimney Actual

Center Point

Plumb
Line
Plumb	Imaginary
Bob
	Center
	Point

Figure 16 - Dropping Plum Line

from Ceiling

INSTALLING FIRESTOP SPACER

Install the firestop spacer from beneath the ceiling as shown in Figure 17 unless the space above is attic space.

In an attic, install firestop spacer at the floor level of attic. You must have joists or headers on all four sides of the spacer. Use a minimum of four (4) 8-penny nails to secure the spacer. See Figure 18.

Inlet Air Pipe	Floor Joist
			Inlet Air Pipe
Flue Pipe		Ceiling Joist

Flue Pipe

Header	Firestop
	Spacer	Firestop Spacer
	Chimney Section	Header
		Chimney Section
Figure 17 - Installing Firestop Spacer		Figure 18 - Installing Firestop Spacer
at Floor Level		at Attic Level

61D0008 17