Roof Preparation - Dometic 457915 Installation & Operating Instructions Manual

INSTALLATION INSTRUCTIONS
Dimensions Are Nominal
FIG. 5
40-1/2"
12"
Center Line Of Unit
Keep These
Air Flow
Areas
Free Of
Obstructions
4"
FIG. 6
Dimensions Are Nominal
13-7/8"
40"
4"
Center Line Of Unit
Keep These Air
Flow Areas Free
Of Obstructions
18"
d.  Maintain structural integrity.
Otherwise damage to product and/or RV
could occur.
The roof must be designed to support 130
pounds when RV is in motion. Normally
a 200 lb. static load design will meet this
requirement.
e. Check inside the RV for air distribution box
(hereinafter referred to as "ADB") obstruc-
tions (i.e. door openings, room dividers, cur-
tains, ceiling fixtures, etc.). See (FIG. 7).
Model
640312C
640315C
640316C
10-3/8"
29"
Roof
Opening
Front
4"
Model
H540315
H540316
30"
Roof Opening
Front
4"
FIG. 7
23-1/8"
2-5/8"
Dimensions Are Nominal
11-9/16"
3-7/16"
Roof Opening
3-7/16"
6"
B.

Roof Preparation

1.   FIRE OR ELECTRICAL SHOCK
HAZARD. Make sure there are no obstacles
(wires, pipes, etc.) inside RV's [roof / floor /
walls]. Shut OFF gas supply, disconnect 120
Vac power from RV, and disconnect positive (+)
12 Vdc terminal from supply battery BEFORE
drilling or cutting into RV. Failure to obey these
warnings could result in death or serious injury.
 O pening Requirements - Before prepar-
ing the ceiling opening, read all of the fol-
lowing instructions before beginning the
installation.
If an existing roof vent opening will NOT
be used a roof opening MUST be cut
through the roof and ceiling of the RV.
This opening MUST be located between
the roof reinforcing members.
2. Roof vent removal
a. Unscrew and remove the roof vent.
b. Remove all caulking compound around
opening.
c. Seal all screw holes and seams where the
roof gasket will be located. Use a good grade
of all weather sealant.
d. If the opening exceeds 14-3/8" x 14-3/8", it
will be necessary to resize the opening. See
"B. Roof Requirements" on page (4).
6
Faces
Front
21-1/8"
11-9/16"
21-1/8"
2-7/8"