Nordyne SERIES M1B Example of Flat Jack with Flashing, Example of 2½/12 Slant Jack, Slant Deck

Figure 17. Example of Flat Jack

with Flashing

Figure 18. Example of 2½/12 Slant Jack

with Flashing

If the home is located in regions where snow accumulation exceeds 7”(HUD snowload zones) use an external roof jack extension (p/n 901937). Extensions are optional accessories and may be purchased through your NORDYNE distributor.

Locating and Cutting Roof & Ceiling Openings

DO NOT ALLOW DEBRIS TO FALL INTO THE FURNACE. THIS COULD CAUSE UNSAFE OPERATION AND VOIDS THE FURNACE WARRANTY. Use the top cap that comes with the furnace packaging (or alternate protector) to prevent debris from falling into the furnace before the fi nal roof jack connection is made

1.Locate center of Roof Jack opening, measure 13 1/2” from the rear wall of closet or alcove along the center line of furnace and fl oor opening. See Figure 19.

2.Cut ceiling and roof holes as follows:

•Ceiling = 8 3/4” (222 mm) diameter

•Roof = 9 3/8” (238 mm) diameter

IMPORTANT:

R e f e r t o t h e i n s t a l l a t i o n i n s t r u c t i o n s p r o v i d e d w i t h o p t i o n a l a i r c o n d i t i o n i n g p a c k a g e s w h e n i n s t a l l i n g furnaces with optional cooling c o i l c a b i n e t o r w i t h o p t i o n a l C * s e r i e s i n d o o r c o i l s .

		20"
		C
		L
		10"
	REAR WALL OF CLOSET OR ALCOVE
24"	OUTLINE		13 1/2"
	FURNACE	CEILING
		CUT-OUT FOR	C
		FLUE AND	L
		ROOF JACK
			FURNACE
			OUTER
			DOOR

Figure 19. Cut-Out Dimensions for

Flue & Roof Jack

ROOF JACK SERIES	IF ROOF PITCH IS:	SLANT DECK	“X” FACTOR
		FLASHING NUMBER	IS:
	2” in 12”	903893 (2.5/12)	2-1/8”
	2-1/2” in 12”	903893 (2.5/12)	2-1/2”
“F Series	3” in 12”	903894 (3/12)	2-7/8”
	3-1/2” in 12”	903894 (3/12)	3-1/4”
	4” in 12”	903895 (4/12)	3-5/8”
	4-1/2” in 12”	903895 (2.5/12)	2-1/8”
“S” Series (2.5 / 12	5” in 12”	903895 (2.5/12)	2-1/2”
	5-1/2” in 12”	903894 (3/12)	2-7/8”
Pitch only)
	6” in 12”	903894 (3/12)	3-1/4”
	6-1/2” in 12”	903895 (4/12)	3-5/8”

Optional Deck Flashings for Flat and 2.5/12 Pitch Roof Jacks. 4/12 Pitch Roof Jacks not applicable.

Table 5. Slant Deck Flashings

12