A.O. Smith FDVT, SDV owner manual Possible Extension Combinations, Vertical Extension Kit Height

FIGURE 9

Unless otherwise specified at the time of ordering, a standard extension kit is individually packaged and shipped within the

water heater carton.

POSSIBLE EXTENSION COMBINATIONS

FIGURE 10

FIGURE 11

WARNING

At no time can more than one Vertical and/or one Horizontal Vent Kit be used.

VERTICAL (EXTENSION KIT) HEIGHT

It is simple to determine which kit is needed for vertical height. Take the total height (to the top of the flue) required and comparing that to “F DIMENSION” in TABLE 1, it can be determined which kit needs to be used vertically.

WARNING

Obstructions and deteriorated vent systems may present serious health risk or asphyxiation.

FIGURE 12

TABLE 1.

	BTU’s			FDIMENSION
*GAL.	in 1000’s	900068-7	900124-6		900124-7		900124-8
CAP.	NAT/L.P.	STD.	MIN.	MAX.	MIN.	MAX.	MIN.	MAX.
40	36/36	63-3/4	72	77	77	88	88	110
50	38/38	72	80-3/4	86	86-1/4	97-1/4	97-1/4	118-3/4
40	40/40	63-3/4	72	77	77	88	88	110
50	48/44	76	84-1/4	89-3/4	89-3/4	100-3/4	100-3/4	122-3/4
75	55 NAT.	76-1/4	84-1/2	89-1/2	89-1/2	100-1/2	100-1/2	122-1/2

*See models and rating plate attached to the water heater for specific model number and other detailed information.

HORIZONTAL (EXTENSION KIT)

To determine the horizontal length and extension kit needed, simply plug the dimensions “D” and “G” into the equation below. The answer “E” should then be located in TABLE 2. The size range in which “E” dimension falls indicates the kit that should be used horizontally to obtain the desired length.

EQUATION: D + G = E

“D” = The wall thickness

“G” = The distance wanted between the edge of the water

heater and the inside edge of the wall

“E” = The distance the extension kit must be able to extend

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