Bradford White M-I-MH40T6FLX - Manual (Page 11)

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Installation (Combustion Air Supply) continued-
to cover this fresh air opening. (Note: Leg enclosure may also be used with
this installation.) Note: When a mobile home is tightly skirted, an air inlet
opening in the skirting must be provided. The opening shall have a
minimum free area of at least 9 square inches (22.9cm
2 ). If the opening
is screened or covered with a louver, the total free area must be at least
9 in
2 (22.9cm 2 ).
INSTALLATION C - An optional 3” (7.6cm) diameter telescoping air intake
and leg enclosure are required to supply fresh air to the water heater for
combustion (kit P/N 239-37025-01 for 30 gallon (113.5L) water heaters and
239-37025-02 for 40 gallon (151.4L) water heaters. Note: When a mobile
home is tightly skirted, an air inlet opening in the skirting must be
provided. The opening shall have a minimum free area of at least 9 in
2
(22.9cm 2 ). If the opening is screened or covered with a louver, the total
free area must be at least 9 in 2 (22.9cm 2 ). The following steps must be
followed for proper installation of these air supply components: (Refer to
Figure 4.)
1. After selecting the proper location for the water heater, cut a 4”
(10.2cm) diameter hole through the floor and all other layers of flooring
and sheathing directly beneath the center of the water heater.
2. Insert the air intake into the 4” (10.2cm) diameter hole and fasten to the
floor with the screws provided.
3. Adjust the air intake so the lower tube is extends below the underside
sheathing and secure with the screws provided. THE BOTTOM OF
THE AIR INTAKE MUST BE AT LEAST 12” (30.5cm) ABOVE THE
GROUND LEVEL.
4. Seal the openings around the air intake and underside sheathing to
resist the entrance of rodents.
5. Position the water heater so it is centered above the air intake. (Note:
The water heater should also be centered with the openings in the
roof and ceiling to allow for correct assembly of the roof jack to
the draft diverter.)
6. Wrap the leg enclosure around the water heater legs and position the
bent tab within a slot at the center of an accessible leg. Overlap the
opposite end of the leg enclosure over the bent tab section and fasten
to the leg with the sheet metal screw provided.
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