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AIR FLOW Figure 7 HIGHBOY FURNACE (Figure 7) Side installation. Filter is mounted vertically, where return air enters side inlet of furnace. HIGHBOY FURNACE (Figure 8) Installation beneath furnace. Filter mounts horizontally, where return air enters from below. Raise furnace and install beneath base. AIR FLOW Figure 10 HORIZONTAL FURNACE (Figure 10) Filter is mounted vertically in the return duct near furnace. LESS THAN 7 INCHES FIGURE 9 OFFSET AT LEAST 9 INCHES OFFSET INSTALLATION (Figure 9) Typical use of duct offset to match air filter opening. If duct connection to furnace allows less than nine inches for mounting the air filter, shorten the lateral trunk, or attach an offset fitting to the elbow. 5 Optional method (Bend tabs outward at 90° angle) Optional method (Bend tabs outward at 90° angle) N REMOVE OLD FILTER AND DISCARD (Figure 11) NOTE: This filter may be mounted in the furnace compartment. CLEAN BLOWER COMPARTMENT NOTE: The air filter cannot remove dirt from blower and ducts. INSTALLATION The following is a typical installation of the air filter on a “Highboy” furnace (Figure 7). 1. Place the air filter compartment on the floor. Stand it upright with the door facing you (Figure 2). If a horizontal installation is being planned, lay the compartment on its side, this will help you to visualize the relative location of all parts. 2. Unscrew the knob, remove the door (by grasping top and pulling door away from compartment) and set it aside. Remove 5” filter. Set in a safe location until the compartment is installed. 3. Set the compartment next to the furnace (if possible) to match the opening in the compartment. If the furnace opening cannot be enlarged, a transition fitting should be used. (Figure 3). The compartment can be attached directly (Figure 12), or a starting collar can first be fitted to the furnace inlet. A butt or slip joint can be used. Securely attach the compartment to furnace inlet, using at least two of the mounting holes on each side of the compartment. 4. Using butt joint, attach duct work (normally an elbow) to the upstream side of air filter compartment. (Note the use of the sheet metal turning vanes inside the elbow to improve air distribution.) (Figure 13) NOTE: An optional method of attaching duct work to the air filter cabinet is to modify the compartment (Figure 14) by bending the tabs outward at a 90° angle and attaching duct work to tabs. Transition Fittings If the air duct does not fit the compartment opening, a transition fitting should be used. Gradual transitions are preferred for greatest efficiency. Not more than four inches per linear foot (approximately 20° angle) should be allowed (Figure 3). 5. Connect the vertical duct section to the elbow. Wedge a wood block between floor and elbow for support (Figure 15). 6. Seal all joints in the return air system downstream from the air filter with duct tape to prevent dust from entering the air stream. Tape is usually applied on the Figure 11 Air Flow Turning ...

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