Thermador HMWN30FS 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 to remote duct transition as close as possible. In order opreference, 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. 1. Prepare duct and conduit cut outs, see figures 1 and 2 as needed. Model 30" 36" 48" X 2-3/4" 4-9/16" 10-9/16" X 10-1/2 22 5- 7/8" 2. Assembly of the 10" transition: The transition supplied with the hood mounts to the top. Do not install transition until hood is fixed on cabinet or wall. a. Place the transition piece over the hood outlet and secure with 4 screws provided. (Figure3) b. Wrap all joints (metal transition and hood) with duct tape for an airtight seal. c. Remove tape holding damper. Hood outlet Figure 1 Figure 2 23-1/8" Figure 3 Screws (4) 8 Transition