Bosch DUH30252UC Installation Instructions - Page 8

TABLE 2. DUCTWORK INSTALLATION GUIDELINES For safety reasons, ducting should vent directly outdoors (not into an attic, underneath the house, into the garage or into any enclosed space). Keep duct runs as short and straight as possible. Duct fittings (elbows and transitions) reduce air flow efficiency. Back to back elbows and „S" turns give very poor delivery and are not recommended. A short straight length of duct at the inlet of the remote blower gives the best delivery. Transition to duct from the integral blower or remote duct transition as close to the downdraft as is pos-sible. In order of preference, use 1st. 10" round duct 2nd. 8" round duct 3rd. 3-1/4" x 14" duct 4th. 7" round duct 5th. 3-1/4" x l0" duct 6th. 6" round duct The use of flexible metal round duct should only be used when no other duct fitting exists. Limit use to short lengths and do not crush when making corners. After having choosen the vent option, proceed as follows: 2. Remove the round transition from its seat by unscrewing the its fixing screws (save the screws). 7" Round Transition 3. Remove the grease filters. 4. Remove the junction box cover. J-Box Cover Remove either the top or the back wiring knockout according the preference and install an approved wiring clamp wiring clamp 5. Remove the duct knockouts using a flat blade screwdriver and a small hammer. Use the screwdriver by knocking out the pannel in similar fashion to a scalpel. Take care of sharp edges. Attention! If is intended to use the hood in recirculating version do not remove any duct knockouts and order the necessary charcoal filter from your supplier. R1 Rectangular vertical discharge R2 Round vertical discharge R1 Rectangular horizontal discharge R1= Remove rectangular duct knockout only. R2 = Remove semicircular and rectangular duct knockouts. 8