Lide Glass Lid 3500P, 3502, J3500 GUIDELINES FOR EXHAUST VENTING SYSTEMS DESIGN, CONT……

GUIDELINES FOR EXHAUST VENTING SYSTEMS DESIGN, CONT……

To determine whether a 3” or 4” exhaust system should be used, follow the guidelines below:

1)Determine the “equivalent pipe length” for each component used according to the comparison chart below. Add the “equivalent pipe length” of all components to get the “total equivalent pipe length”.

2)Determine the altitude at which you are installing the stove.

3)Cross-reference the “total equivalent pipe length” and the altitude using the graph below. NOTE: The “total equivalent pipe length” should not exceed 30 feet.

Component	Equivalent Length		Equivalent Pipe Length
Horizontal Straight Pipe	Actual Length in ft. x 1.0	Horizontal Pipe	=	1 x (2+1) =	3 ft.
Vertical Straight Pipe	Actual Length in ft. x 0.5	Vertical Pipe	=	0.5 x 8 =	4 ft.
900 Elbow or Tee	5.0 feet	90 Degree Tee	=	2 x 5 =	10 ft.
450 Elbow	3.0 feet	45 Degree Tee	=	1 x 3 =	3 ft.
		TOTAL	=		20 ft.

NOTE: These are guidelines only. Proper venting is accomplished by design and common sense. In most installations 3 inch diameter venting is adequate. If it does not vent properly you will have to change it to 4”.

	CRITERIA FOR SELECTING PIPE DIAMETER
		MAXIMUM
25
20
		4” DIAMETER ONLY

15
10
5	3” OR 4” DIAMETER
0

0	2	4	6	8	10	10	12
0	2	4	6	8		12

ALTITUDE X 1,000 FEET

12