Used with Suncourt Flush Fit Register Booster, sold separately, model number HC500-B. Adaptor plate to fit register sizes sold separately for sizes 6 x 10, 6 x 12 and 4 x 12.
- Fits wall/floor register sizes: 6 x 10, 4 x 12, 6 x 12
- Used with Suncourt flush fit register booster, sold separately model HC500-B
- Simple snap in installation