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You can read the recommendations in the user guide, the technical guide or the installation guide for FRIGIDAIRE FRA25ESU2. You'll find the answers to all your questions on the FRIGIDAIRE FRA25ESU2 in the user manual (information, specifications, safety advice, size, accessories, etc.). Detailed instructions for use are in the User's Guide.
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NOTE: If wall thickness is 8-1/2" or more, add alumimum flashing over bottom of frame opening to assure no water can enter area between inner and outer wall. NAIL SPACERS TO STUDS FIG.3 FIG.. Your user manual FRIGIDAIRE FRA25ESU2...