C. OPENING PREPARATION:
1. If the opening exceeds 14-3/8" x 14-3/8", it will be necessary to install spacers.
2. If the opening is less than 14-1/8" x 14-1/8", it must be enlarged.
3. Route a 12/3 Romex type supply line from the circuit breaker box to the Front of the
roof opening.
a. The power supply must be on a separate 20 amp Time Delay Fuse or HACR
Circuit Breaker.
b. Wiring must comply with all National, State and Local wiring codes.
c. Make sure at least 15" of wire extend into the roof opening to ensure easy
connections.
4. The opening must be framed to provide adequate support and prevent air from
being drawn from the roof cavity. Lumber 3/4" thick or more and long enough to
bridge the opening must be used. Remember to provide an entrance hole in the
front of the opening for 110v, 12v, and thermostat wires. See FIG. 5.
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