Roof Jack Instruction

ROOF JACK & AIR INTAKE INSTALLATION INSTRUCTIONS
(FOR MANUFACTURED HOME CLOSED COMBUSTION WATER HEATERS)
Step 1. Determine final installation
location of the water heater. Refer
to the installation and operation
instructions provided with the
water heater to allow for
appropriate clearances to
combustible materials.
Step 2. Cut a 5 1/2” - 7 1/4” diameter hole
in the ceiling and roof directly
above the flue outlet (water
heater centerline).
Step 3. Drop a plumb line from the center
of the holes in the roof and ceiling
and mark that position on the floor
(this position is the water heater
centerline).
Step 4. Mark the intake centerline (4 1/2”
toward the front of the water
heater centerline) on the floor and
cut a 4 3/4” diameter hole in the
floor and the underside sheathing
(see Figure 1).
Step 5. Insert the air intake into the 4 3/4”
diameter hole in the floor and
fasten to the floor with the (4)
screws provided.
Step 6. Place the air intake seal on top of
the air intake mounting flange and
around the 3” diameter tube (see
Figure 2).
Step 7. Adjust the air intake so the lower
tube extends below the underside
sheathing and secure (see Figure 3).
Step 8. Seal the opening around the air intake and bottom sheathing to resist the entrance of rodents.
Step 9. Position the water heater so the opening in the base will engage the air intake tube extending
above the floor (see Figure 3).
Ø5 1/2” - ø7 1/4”
IN ROOF AND CEILING REQ’D
(WATER HEATER CENTERLINE)
ROOF
CEILING
WATER HEATER
CENTERLINE
FLOOR
UNDERSIDE
SHEATHING
INTAKE
CENTERLINE
Ø4 3/4”
IN FLOOR AND UNDERSIDE SHEATHING
(INTAKE CENTERLINE)
4 1/2”
238-37245-00B 11/09
PAGE 1
Figure 1
NOTICE
Air intake installation is only required
for water heaters that are NOT
Flammable Vapor Ignition Resistant.