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SECTION 6 Ducting CAUTION: ALL DUCTING MUST COMPLY WITH LOCAL AND NATIONAL BUILDING CODES. NOTE: Insulated ducting is required for bathroom exhaust applications, where ducting passes through unconditioned space or where noise is a factor. Failure to use insulation could result in excessive condensation buildup within the duct, and undesirable sound levels within the room. Duct runs should have as few bends as possible. NOTE: Flexible insulated ducting may be used where allowed by local code. For the quietest possible installations, it is recommended a minimum of 8' of insulated flexduct be used between any exhaust grill and fan. When using flexible type duct work, duct should be stretched as tight and straight as possible. Failure to do so could result in dramatic loss of system performance. Flexible duct should be connected to the fan with screw clamps or duct tape. All connections should be as airtight as possible to maximize system performance. 1. Connect one end of the ducting (not included) to the room level collar/damper and the other end to the “Y” transition. Secure both ends in place using tape or a screw clamp to create as air tight a seal as possible. Repeat this step for the other room level grill housing (Figure 7). Exhaust to Wall/Roof Cap Fan “Y” Transition Collar/Damper Ducting Figure 7 NOTE: Units that include only one collar do not utilize the “Y” transition. Follow the same instructions as in step 1, except connect the one end of the ducting directly to the fan. 2. Connect one end of the ducting to the top of the “Y” transition and the other end to the intake of the fan (Figure 7). 3. Connect one end of the ducting to the exhaust of the fan and the other end to a wall or ceiling cap (Figure 7). Always duct the fan to the outside through a wall or roof cap. 5S7635036 New 9-06 3 of 12 NOTE: When using insulated flex duct, it is recommended that the inner vinyl core be screw clamped or taped to the inlet and outlet and that the vapor barrier surrounding the insulation be taped to the fan housing. NOTE: When attaching flex duct to the collar/damper combination and an immediate elbow is necessary, be certain that the elbow is installed with a "soft" bend to allow damper blades to operate properly. SECTION 7 Installing Optional Balancing Damper Some kits include an optional balancing damper to allow for adjustment of the system. The damper may be used where the grills will be connected using branches of unequal length or where the flow will need to be balanced for any reason. To Install the optional damper: 1. The damper must be installed on the branch with the least restriction. This is generally the duct that is shortest or has the fewest bends. 2. Drill a 5/16" hole approximately 1-1/2" from the edge on the flat side of the “Y” transition. 3. Insert the shaft of the damper into the hole drilled in step 2. Place the washer, handle, then wing nut onto the shaft (Figure 8). Figure 8 Damper “Y” Transition Hole W...

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